What do you do

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?

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.

I am struggling right now with intrusive harm urges. They feel real and it feels like I am going to act any second. It feels like I have to hold myself back, which is a scary thoughts. I am trying so hard not to compulse, but does anyone have tips on what they do in these situations?