>>937589how tall are you? I used to be around 115lbs at 5'11 as a teenager and my doctor was just like 'nah its fine, you will fill out in your mid 20s'
I used to cycle around 30 miles a day from 19-22 and i wasn't much heavier then but i would eat loads, then i stopped cycling and now im full on dad-bod at 165lbs at 26.
Just do some fucking exercise.