Do I really have OCD or is this normal?

For a long time I have been told I have symptoms of OCD from other who do have it and then there’s people like my family who say it’s just normal (for reference I am only a teenager and not an adult). My family is very old school and thinks that medication turns you into a zombie, My brother suffers from Bipolar Disorder and has stopped taking meds for a while now because my grandparents convinced him it was all in his head even when he had extreme suicidal thoughts. I can relate to a lot of what my brother has told me but have never owned up to it to everyone else I’m fine I have good grades and keep my life together or at least that’s what I want others to see. I have very close friends who do struggle with mental health issues and think that I do have some too based on what I tell them. I constantly replay situations, need things to look right in order to feel like I can breathe, as well as intrusive thoughts and guiltiness. I have days where I wish that everything would stop by any means necessary and have done self harm without anyone knowing. But other days I and happy and fine and enjoying myself and these moods can change at any given time, hours, days, weeks. I also have been told I might likely have ADHD because I tend to get bored and over things quick to start something new and either focus on it really hard or just leave it again, that then leads to procrastination and then nothing getting done which makes me feel even more guilty and then I start to feel down too. It’s like I can’t commit to anything because it won’t get done or I do it and think “why couldn’t I have done that in every other situation?” I know this is a long rant and nobody may read this but I would really appreciate any advice at all, is this all in my head? Do I really have OCD , ADHD, etc? Am I just being a Hormonal teenager?