After living for so long, finding the closest person around me is my biggest obstacle and stumbling block. Why do my relatives create stumbling blocks for themselves?

Because they know you too well and grew up with you, they really positioned you and thought you could, but you can't be too good. If you are too good, you will surpass them, which is unbearable in their hearts, so they can't expect you to become better, and they don't want to see you surpass them too much. Therefore, when you praise and become excellent, they will become bad, make you fail and make you as excellent as them.