Are you guys sad/depressed without knowing why???

Sometimes i feel like im using ocd as an excuse. What if i dont really have it and im just freaking myself out? Does anyone feel this way

Really bad theme right now is death, I keep thinking about how one day or at any moment my heart will stop my brain will stop & my memories & everything I know will all fade away. It is giving me so much anxiety I’m only 18, but I realize it all happens to us it is bound, we are born to die. I know it’s a silly thing to be scared because it’s not helping the quality of my life worrying about it and even when I do die, I won’t care , if you don’t have a working brain then how can you care 🤷‍♀️. It is tainting my everyday life currently & honestly making me terribly depressed & it is giving me derealization & making me feel nihilistic, I’ll remind myself it’s okay but then with my ocd i don’t stop thinking and thinking about it and it’s seriously so hard to stay present in the moment because this thought just feels like I can’t scrub it away it’s miserable I struggle with religion, but I do pray to anything that’s out there possibly listening, because it is comforting, it just feels like this whole experience Is pointless & I am afraid of the unknown and what is to possibly happen but I’m subjected to it anyways so why should it matter

i’m a new user on this app, I downloaded it just cause I was curious, I don’t really know if I have OCD. Because in school all I learned about OCD is things being out of place and having it to be perfect almost like perfectionism, but I’ve just recently realized there’s a whole kind of different types of OCD, some things I struggle with daily is a fear of bad things happening or almost like an impending doom of when is it gonna happen? I’m always in my head thinking feels like I’m having multiple conversations at once. Sometimes it doesn’t even feel like I’m having a conversation with myself. I have horrendous anxiety about everything and anything talking to people being around people. It just feels like it consumes my everyday life and I don’t know what to do. I can’t clearly remember anything from my childhood and some things I feel like I may be imagining I just don’t really feel like a person. I’m always thinking the worst in my relationship over analyzing and stressing out thinking of scenarios or thinking, my boyfriend‘s cheating on me. It almost all feels out of my control.