What are the best ways to stay in the present?I’m none stop ruminating on the past and future. :)

My last and almost life long theme/sub-theme largely subsided recently and my ocd felt like it wasn’t even an issue. Then I went on winter break from uni and being alone made my mind come up with a whole new topic to obsess over. TLDR on my fears, my advisor wouldn’t email me back for a while about signing up for classes so my mind started to worry “what if he doesn’t in time and you can’t enroll this semester and you lose this whole life you just built and all these new friends” So when that issue was resolved my mind found other scarier ways I could be uprooted from my current life and friends that I’ve grown so attached to. Then my mind remembered back when I was struggling with false memories and scrupulosity and I essentially made a post on a forum 2 and a half years ago saying I did something or was convinced I did something that I never actually did. Now I’ve been spiraling about someone finding it reporting me and I either get seen as a horrible person or arrested or something over something I never actually did but “admitted” to out of fear of going to hell. My mind won’t let it go and keeps finding new reasons for it to be “valid” “logical” or even inevitable. I feel like it’s just hanging over my head and I can never rest easy. Especially when I try to focus on my daily tasks or plan for the future I get this horrible flair up of “why plan for the future when this could come back in that future and you get uprooted from all of it” my mind won’t rest without certainty being uprooted won’t happen but certainty doesn’t exist, at least not with ocd. This sucks and I miss being care free.

So maybe the title wasn't the best to to put it but when you guys start having obsessive thoughts how do you stop them before it turns into compulsions and anxiety?

Everyday I wake up, all my mind makes me think of is the stuff I’ve done in the past, like all day I’m in a constant cycle of judging who I used to be and it hurts so so much. I wish I never thought to do those things, I wish I had been more mature than how I was before, it’s really lowering my self worth and I don’t think I’ve ever felt this miserable before, like last summer was the worst because I was dealing with this shit, I about almost ended my life over it, and I thought it would get better, which it did, but it didn’t last but for a while. As soon as it became 2025 I was going through it again, having constant cycles of “I’m a good person” to “I’m the worst person imaginable” and I’m so sick of it because I just want to feel like the good person l like to imagine myself to be, but I can’t because of shit I did in the past that I obsess over. I’ve cried and screamed so much over it and it seems like it will never leave me.