Seeking opinions and advice

Hi I'm eighteen, I just wanted to get someone's opinion on my situation.

Since May 2024? (My memory hasn't been really good lately), I've been hearing people it is consistent all the time and I can't make it stop. My friends keep telling me that I'm acting strange I'm saying things are there, or that something is happening when it actually isn't (I thought they were messing around with me but then my teachers started bringing it up). I want to tell someone desperately, I hate it, all I seem to feel is paranoia. I don't enjoy things anymore, i don't care much for anything or anyone, I use to struggle a lot with depression and it seems I can't even feel depressed anymore. All there is is this constant sense of paranoia in everything I do, even when I'm alone. I've tried reaching out to anyone I can, but anytime I try it's like my mind physically won't allow me to say the words, I try writing it down and my body won't let me hand over the paper. Even as I type this I'm unable to say the full extent of what's happening or specifically what my experiences are. I'm just hoping this is enough for someone to help because I'm lost, I have no idea what's going on, only that it seems that everything I think is going on around me is real, people are telling me differently.