Recently, most adolescents, after reading some articles, put themselves on their own diagnoses like "bipolar personality disorder" and others, although they are simply faced with a transitional age. I believe that it is better not to diagnose yourself on your own, but to turn to a psychologist, because they still studied and delved into psychology and understand this better than ordinary people.
I, of course, do not understand anything about this (but the water in my ass will not hold), but probably first you need to determine your norm - for example, what exactly is the state of peace / happiness for you, how you are used to suffering (for example, Is it easier for you to cry and move on or is there a habit of "keeping your face" and "all in yourself"), etc. Probably, you need to take into account your whole life, including childhood, the base, according to the mind, is still being laid there. Then identify "exceptions to the rule", situations when you did not react as usual in such cases. Decide whether you like these "exceptions" in yourself (a la whether you behaved in them wiser / more resolutely than usual, etc.) or frighten (for example, outbursts of aggression, or cowardice / cowardice). If you don't like it, take into account the frequency of such "exceptions", whether they appeared relatively recently or maybe after some specific event.
well, with this already go to the pros.
Probably if in any situation, any person could determine his own condition himself, there would be no need for doctors and psychologists. But the world is so arranged that in general it is not possible. There is no magic dough and most likely there won't be.
But if you are tormented by doubts, or it seems to you that something is not as it should be. It may be better to contact a good specialist for advice