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I have the same problem. I'm 21, and look like literally someone who hasn't gone through puberty, especially since the last year when I have gotten underweight due to a lot of stress. I've never been really big, but in high school I had a normal weight at least and had nice hips. At that time I was only insecure about my face full of acnea. When i didn't have it anymore (ironically, it was when I didn't care about it after trying so much to get rid of it), and when I cut my hair 3 years ago, I started to accept myself, accept my small boobs,trying to love myself more. And it started well. But now I feel the most insecure again, of my body, even my face that I liked I don't fin it pretty anymore when I look in the mirror. Just like you it's mostly partly because my bf likes everything that I'm not, he likes tall and big women, lol. And I feel insecure next to whoever look bigger than me. Him being also insecure about being short I feel like it got pojected on me a well. I guess it's just a big mess.
This girl... She would appear on my feed all the time, featured in makeup/beauty pages. I find her lips weird looking, and they unfortunately looked so much better before. It's also annoying how she makes silly expressions in her videos and keeps saying ''wow'' all the time.