i feel like my 20s so far are the loneliest years of my life. for a reason i cant put my finger on

Problem/Goal: im quite confused myself on why im lonely. ive definitely been in worst head spaces as a teenager struggling with physical insecurities. i wonder if this is a phase people go through in their 20s or its just me? i find myself worrying too much about things that ive never worried about before, even if i know better. i get conscious of how i come across and how people perceive me. if im likable or if im tolerating too much and letting myself be disrespected and used. i know better, but it doesnt stop me from feeling anxiety or acting a certain way to make people like me. but i just come off as awkward. its not like i dont have friends. my group of friends was really solid 2 years ago. until life happened and we sorta just have different lives now even if we talk occassionally. i have friends i could ask to hangout or rant to. but i always just feel the same. there's this lonely feeling i cant put my finger towards.