self-diagnosis and self-evaluation are valid, but be careful about it. you could massively improve your mental health, or ruin it. so do your research and don't take extreme measures.

whether you want an official diagnosis is up to you; all it really does is give you something you can show to prove you need accomodation. it also has the downside of potentially denying you rights on the basis of your disability or leading to abusive treatment regimes. it depends on your circumstances whether the positive or negative side shows more, for me it's about neutral.

what's really important is that you accept yourself regardless of diagnosis and don't spend your life trying to conform to social norms that are slowly killing you.