I absolutely hated my creative space for years. I'm replying to this to address multiple issues troubling OP, bear with me.
Abstract: Making your space comfortable for you, and learning tricks to overcome the things that disturb your work is gold. oro puro.
Firstly, if you are truly stuck in a bad spot mentally, you need to start looking at your options and trying some of them.
Finding someone to talk to in a safe space is very important, and don't just pile everything on bff/gf/bf/partner/spouse/family. Few share your passion completely unless they're doing the same exact stuff as you.
Save yourself the heartache and frustration, find a friend, mentor, and/or a therapist.
(microdosing and making friends are both significantly more affordable avenues that can be equally as valuable for some individuals in the long run)
Regarding issues with workflow/ergonmics:
I install production AV systems professionally, so I have a unique perspective on things sometimes.
My place is a small mixdown/overdub spot, and I live a somewhat nomadic lifestyle, I do remote work, I tour, I travel a lot, so I'm rarely tied to a property for more than a few years, so I like having the freedom from the burden of being "stuck" or "attached" to a property.
In my shop, nothing outside of cable management is installed in a manner I cannot later reconfigure, the whole place is designed for flexibility, mobility and ease of service.
Everything is in well built racks, so we can take the entire rig out, pack it for transport for remote work in under an hour. it's an installed rig on wheels but that's the utility that I prefer and enjoy
personally. This makes me a very happy boy.
Simply having everything the way I want it, brings me pride and joy every time I'm in the room, because I did EXACTLY
what I wanted (for once in my life) and I can change it at any time.
About once a year, I do a routine overhaul of my entire room, we pull out EVERYTHING, clean, service,, and reinstall everything, and every time I'm more happy in the space.
Figure out what annoys you about the space and make "shitlist" in something like Asana or Keep/Notes and systematically design your room to your liking, if you're not modifying the existing construction and installing stuff permanently there's little need for making drawings to scale, some folks love to work that way, many dont, follow your heart.
Abstracts aside, lighting is critical to enjoyment and productivity in a space. Experiment and find what helps you feel at ease in your space, with zero regard to anything other than how it works for
you.
We upgraded the lighting this year, even installed in a couple "vibe" lights (I thought it was stupid initially, now I wont go back, I dont care what anyone says, I makes me happier in the space)
Emotional factors:
Respectfully, throwing your hands up and threatening yourself to sell off all your gear will not solve your problems, this is avoidant behavior. I've tried it, and I regret it to this day. I want all the gear I sold when one of my bands split many years ago, but I'll never have that stuff back the way I liked it.
Regarding sensitivity to disturbances:
I think our minds may be a bit similar. I used to get super irritable about street noise around my place(s) in the US... then I lived in Latin America for 3 years and I will NEVER again seriously complain about anything making noise outside of my windows, NEVER.
I tried everything including moving away from cities, I had a house on the side of a mountain in the southern Andes, 10km from ANYTHING, and I still had noise pollution regularly. I traded the city for el campo and I quite possibly almost lost my mind because of it.
Some dumbass kid with 2x15s in the trunk driving by your house once or twice a day is nothing compared to the rest of the world deals with.
I've worked in professionally designed studios and venues that have no choice but to "work-around" the disturbances, unless you're building a place from the ground up, literally like a commercial recording facility and/or in a (very) remote location, this will always be a factor in some way.
I can't think many residential areas in the US outside of NYC that hold a candle to living in a city with lax or no regulation of noise pollution.
If you're tracking with live mics, schedule that work away from times you know there will be noise outside (we dont record on Tue, Wed or Thursday, and having that schedule created took a ton of pressure off me, I have a program now, I stick to it.
Conclusion:
If you're anything like me, I recommend finding tricks (I hate the phrase "life hacks") that will allow you to overcome the stimuli that bothers you, it's not easy, but you will feel like Neo when you understand the true power of having these sensitivities,
it's a strength, not a weakness that I use every day I work.
Not because I'm some salty dog with decades of experience (I'd like to think of myself more like a seaweed crisp), but because my mind is tuned to be
so sensitive, I hear and see stuff other's will usually overlook
constantly. When I realized that about myself, my entire life changed.
Learn to have fun with the process, treat it like building, it's installation, do stuff systematically, have confidence you did it right to your liking. Plan it, don't plan it, whatever you like, rebuild it 5 times if you need, by the end, you'll be excited to use your gear again, even if you change little or nothing, simply improving aesthetics can do wonders for our minds.
I think folks forget that as someone with an understanding in audio production, with a decently equipped project studio, you have a lot of capabilities that folks 40-50 years ago would've sold a limb for. Learn to make it work for you and your personally happiness, that is why we are here.