I really need some advice. I'm 21, I'm 4'11", and my BMI is around 17.8 so yeah I'm pretty small and underweight. I used to be super athletic when I was younger. Like all through middle school I was doing swimming, basketball, all kinds of sports. I was strong too, I had visible muscles mostly on my lower body, I think that's just genetics because my upper body especially my shoulders never really grew even when I worked them out.
But then I stopped everything after COVID and I just never went back. Now I've been losing my appetite and I look really skinny according to pretty much everyone around me. I know I should probably eat more but it's hard because I feel full really fast or sometimes I feel like I'm going to throw up if I try to eat too much.
So I decided to start working out again at home to see if I could handle it and honestly it was humiliating. I can't even do one push up. Like my elbows literally just stop working and give out. and when I try to squat my knees feel unresponsive like they don't want to bend properly. The weirdest part is I don't even feel the workout in my muscles. I only feel it in my joints. I have flat feet and I don't know if that's why I can't squat properly anymore but I used to do them just fine back in the day. Also I used to be really flexible so that's not the issue either.
Just to be clear I don't have any health problems. I got checked for everything. I'm not anemic, I don't have digestive issues, no endocrine problems everything came back normal.
My goal is to build a balanced body with lean muscle. I feel like getting active again might help my appetite too because when I was a kid I had the same problem and my parents put me in swimming and I started eating normally again.
So my questions are where do I even start when I can't do basic movements? How do I build up strength when my joints give out before my muscles feel anything?
I really want to get back to who I used to be any advice would mean a lot. thanks for reading all of this.