Life f*#k*d up, gym & other suggestions

Hey everyone all my life has been pretty f*#k*d up from all directions. Whatever sh#t you can imagine that could go wrong in your life chances are if not all most of it has already gone wrong in my life. I know everyone has their own challenges in their life. To ab agar mai meri puri life story batane betha to reddit ki amma behn ek ho kae gi isliye short me itna smajho due all this sh#t in my life I am f*#k*d up from all directions. Problems of every type Mental, social, emotional, physical, financial and more... To ab is sab ki wajah se my physical & mental health is sh#t. Physically I am getting very weak (I guess it was not always like this) I am 24 but do not look like & I want to build good physical health asking opinions and help how I can. Suggest whatever you think can be helpful. Unable to gain weight due 24/7 tension, depression, stress and other sh#t. Also I would I like to add that I am quite nervous to go yo gym because of constant Indian society judging you on everything if you are somewhat below avg. Give me your suggestions what I should do. Thanks in advance.