I've been trying to write a response since you posted (last night for me). I suspect you've hit a nerve for a lot of us. You should see all the rejected drafts.
I'm a guy but much of what you posted hits home for me. I've never been a social person. Invisible was my default condition and I'm generally good with that. My brother is the opposite, very outgoing, social, can act like he's known a person for years on their first meeting. Gawd I admired his ability and often was jealous of it. My son is very much the same as my brother. There were times and situations when I completely wished I could just do what they do.
Over the years though I've become more accustomed to and comfortable with my invisibility. I don't do pictures, most of my outreach is in writing. I believe it's our character not our appearances that are important. As an introvert and perhaps a curmudgeon I don't 'waste' time trying to be social. Being social is work and draining for me. I don't like it, so I avoid it. I get to focus on the stuff that interests me or my spouse who likes me the way I am. I am lucky.
I'm generally happy where I am. If you're not then please talk to someone you trust like your spouse, or a therapist, or if you think it's what you want, someone who can help you change.
For the record, many of us are anonymous here. It's how we can be honest, vulnerable, and ask for help. Thanks for trusting us.
Good luck,
Tek