Your situation is the same as my colleague's. Being born thin not only affects his job search, but also makes it difficult to date or find a girlfriend. That's what he's worried about now. In fact, I think there are some natural factors and childhood nutrition problems. Actually, being thin is not a bad thing. Some people want to be thin. If you want to be stronger, you don't have to go to any gym. Doing sit-ups and push-ups at home is the best exercise method, but it should be done frequently, that is, in groups. Nutrition should be supplemented in time after exercise. If you can, you can buy some animal protein. If you can't, you can't.