Is there a way or a tell tale sign of it?

I don't think it is severe enough to go to a doctor or anything so I don't want to bother my parents but I also took one of those tests on Google (no clue how trustworthy those are) and that came back 80% what ever that means.

I am also very concerned that I am faking it to have something unique about myself subconsciously which feels like it's extremely disrespectful to the people who do struggle with it which is why I don't say I have it.

I would also add that I am a teenager, so could it just be angst or something like that?

Can it be developed as in I didn't have it as a baby/child but it developed from something?

How do I know for sure?

Please educate me if I said anything false/offensive I am not trying gain attention I just want to learn more about it from people who have it or know people who do have it.