Why won’t my brain shut up from talking to itself all day and night and I can’t shut it off is this a habbit Iv picked up or anxiety

When you get a stuck thought in your mind, as stupid or untrue as it may be, how do any of you block them out, or try to at least? It’s like my mind has another voice telling me making up the stupidest things?

I don't know what to do anymore, the fear of psychosis and schizophrenia is so bad in so hyper aware of everything I hear and everything I see, I've always had eye floaters now I convince myself that it's really me hallucinating, I've always had tinnitus but now I'm convinced it means I'm going to go crazy soon, I can't sit in quiet because all I'm focusing on is what I'm hearing, and searching for any sounds I can't distinguish, when there's background noise I get so anxious if I think I heard something but im not sure I did or I'm just anxious, I'm terrified I'll start having delusions and sometimes my brain confuses some sounds for other sounds for example say I'm hyper focused and I breathe and my nose makes a whistling sound my mind interprets it as a scream and I freak out thinking I'm hallucinating only to focus closer and realize it's my own breathing, earlier I was so anxious that I couldnt tell if I had an intrusive thought or heard something, I don't know how to make it stop, I've been through this theme before I just forgot how hard it was I'm having a panic attack please help

My mind just starts racing with thoughts all day. I overthink aswell so I just tend to sit in the thoughts and can’t escape. I mostly have thoughts that tell me I don’t like the things I do like snowboarding or backpacking or if I even if I love my girlfriend. Deep down I know I do but then I start getting worried that the more I think these things the more they come true. Then I have tons and tons of more thoughts throughout the day and it just feels like I’m constantly having anxiety and constantly battling my brain over things that don’t even make sense. I’m only 17 and this is extremely hard and I feel like I’m wasting these teenage years. I don’t know what to do or where to go. I’ve picked up reading my bible and praying more but the thoughts persist please help.