I was in the same situation too. I used to be overweight and after having an eating disorder (bulimia) I lost all the weight and as unwholesome as it is to say, having an eating disorder did make me prettier.
I understand too that whole thing of not being sure how you're perceived.
For me I got over obsessing about my looks too much because I had bigger problems to worry about. Not that I'm invalidating the body issues that come with bulimia or BDD (in your case) but that's how it was for me. As much as I want to restrict and vomit like, it just too much of a hassle if I did. If I wanted to restrict then I'd get sick or have no energy to study for my classes and do extracurriculars, stuff like that. Another thing is my significant other got diagnosed with a terminal illness so I felt that I had to be someone reliable, I guess. Plus some other smaller problems and daily stressors. At that point it was just kinda more efficient (?) not to be too concerned about looks considering I had bigger fish to fry. idk but having bigger problems helped me reframe how important being attractive was to me. It's still pretty important to me, but if I'd list everything I value in a hierarchy, stuff like family, friends, my SO, and school/career at the top, and being attractive somewhere in the middle.
Unlike in high school where my "glow-up" made me suddenly popular, I was just a plain Jane when I got to university. It made me realize that there are always gonna be people that better than me in some way, so it'd be counterproductive to have too much an inferiority complex. A little inferiority complex can be healthy lol, like motivates you to get better, but too much is just crippling.
Another thing is, both in university and when you start working, people don't care how you look, just that you get the job done. What's the point of someone attractive if they're an airhead, right?
Not gonna give you meaningless platitudes like "everyone is beautiful in their own way" because that's really false, lmao. People that are genetically blessed, physically fit, have enough money for surgery, or those that are talented when it comes to make-up and fashion are blatantly more attractive than people that aren't, like cmon we all have eyes here lol.
As a consolation though honestly attractiveness only really matters if you're on the extreme ends of the bell curve (very ugly or very beautiful). Unless you work in an industry where being attractive is part of the job description (ex. fashion model) or you live in an extremely lookist society where being ugly literally dampens your employment prospects (looking at you, South Korea), attractiveness is mostly irrelevant to the majority of us plain-looking people. People do sometimes get bullied or discriminated against for being ugly, but nobody bullies someone plain for their looks, haha. As for the inverse, unless you're like a goddess-level beauty you won't reap much of the benefits of being attractive, like being given favors etc, you know? haha>>36561
If you're looking for a partner too, it's not a sour grapes thing but I think it's better to not be overly attractive, actually. Like if you're too attractive yeah, you attract a lot of attention, but maybe not the right kind of attention from the right kind of people. yk, like people (usually men) that are just shallow and horny. Not saying that attractive people don't have fulfilling relationships, just that they have more shit to sift through because they have more suitors. Meanwhile, if you're plain (or ugly even) your looks kinda act like a natural filter against shallow people that only care about looks. I find that comforting honestly. Since I know I'm plain, I'm secure that my SO is with me because of my personality lol
Yeah, like >>36553
said, most people don't care about looks, and that hygiene, manners, good fashion sense are more important.
Anyway it's not exactly concrete advice but I hope this helps in reframing things?? Those are the 2 cents from this elder sister :)