How should I react

How do I stop letting my intrusive thoughts control me? Ive been having them for almost a year, once I graduated, become more isolated and lost more friends they've become worse. I feel like when I had friends and was still going to school they weren't as bad probably because I was living more so I didn't take them as seriously. But now that Im home all day and alone they've gotten worse and it feels like they're starting to control my life. Theres times where Im on social media and eventually I forget about them but then when I realize I forgot about them they come back. Sometimes the thought just lingers it doesn't even just pop in my head and go away. I can't tell anyone in my family because they'd judge me for the thoughts and they don't really believe in mental illnesses. I also sometimes think of what other people may think of me if they knew the thoughts I had and it makes it worse. How do I stop letting these thoughts control/trigger me and stop reacting or feeling some type of way about them.

does anyone has any tips how to stop the "what if cycle"?? i have very disturbing what if thoughts on daily basis and they're rlly scary always. i know they're not real but sometimes they feel so real and possible to happen and i hate this

I've been told a lot that in order to get better, we need to tolerate uncertainty, which yea I get that and I'm trying every day more and more to reach that point!! But I've also been told that we need to tolerate uncertainty AND "our worst fears becoming true". Like how does that work, especially with POCD, OCD about a///ault, SA and all of that? Like that is really difficult for me and I don't really understand how I'm supposed to just shrug stuff like that off