Hi

A lot of people have mentioned that I have maybe one of these things
Bipolar disorder
Borderline Personality disorder
Low self esteem
TDAH
Selective Depression
How can I be sure which one(s) it is? And can someone help me find someone to talk to me about it?

@sunnyHuman3401
Hi there. 💜 If you want to be sure, you would probably need to speak to a therapist or counselor in order to get a diagnosis. There are a lot of different mental health diagnoses that have overlapping symptoms, and it's also possible that there could be multiple conditions in play. (Or there could be no diagnoses at all and what you're experiencing doesn't meet the criteria for anything.) Only a licensed mental health professional is equipped with the knowledge to be able to tease apart all of those different possibilities.
That being said, if you're wanting to roughly self-diagnose just to get a sense of which conditions might be applicable, there are some resources out there online. For example, found this by Google searching for "differential diagnosis bipolar bpd":
https://www.psychologytoday.com/us/blog/owning-bipolar/202005/bipolar-and-borderline-differential-roadmap