It's okay, and you don't have to go to the hospital.
Development depends on adolescence, and it is good to adjust your mentality later.
Body, not just thin.
According to modern aesthetic and health standards, the weight should be within the normal range, and more importantly, the temperament between manners and gestures.
Manners include not hunched, not round shoulders, not rich, tall and straight, etc.
Temperament, to put it simply, first of all, we should be confident, have firm eyes, don't make too many small moves, speak and do things decisively, and don't drag our feet.
Look at the photos you sent, in fact, you are thin enough and your clothes are not bad. Don't be too hard on yourself in appearance. People can improve their space in all aspects. As an experienced person, the old aunt thinks that ability and appearance are very important and can work hard in many aspects.
good luck