struggling to battle with my own mind, please help advise, thank you so much. means a lot.

Hey there. It's been quite recently while, since I realized and accepted that I may have a mental health illness. I feel like my thoughts are just the problem, but it seems like I cannot control it in stable way. It seems easy if the problem is only in the mind, but then I had been having a hard time, for a pretty while now trying to solve my mind. From time to time, I tend to have random negative thoughts, which mostly are about people that knows me who are capable of hurting me, will hurt me in most scary way. Then I take small things as hints or a signs, that something bad will happen. Like if there's a scene in a tv show that i watch that there's like someone died or harrassed by a bad person or a killer or a maniac or a very inhuman human, i tend to think that it might happen to me. I'm already very scared of this world. I don't know how this started, but my mind, it feels like I don't own it, that I cannot control it. And I try hard from time to time to fight back. And.. it had been so tiring. To fight my own thoughts. It had been so exhausting. What I know is that I'm so much scared of the people in this world. Sometimes I hear news about crimes then I overthink how inhuman can humans be. I'm just so scared of this world because of those bad people. My heart is crying very loud for the people hurt by bad people. I'm not a kid, I'm already in my mid 20's, and yet, here I am, just got a problem with my own mind, my own self, still trying to figure out how to solve this, and it's taking pretty while now. I think I was traumatized by something or somewhere or someone, I don't know what have caused to start this mind illness that I have. Maybe it had an impact when I tolerated my ovethinkings, like I even bought hidden camera finder, and installed hidden camera detector, cus I was thinking that there was a hidden camera in the boarding house I had stayed for quite some time before. I don't know. I'm just too scared and I despise those bad people who can easily hurt others big time. Or even not easily idc. If you ask me, I believe in the goodness in everyone, but I don't trust that everyone can always choose to do the goodness in them. If I'd be honest, I know I am very soft hearted person, I'm very emotional, I feel deeply, I am a coward, I am super weakling. That's why when I am hurt, I am super hurt. I had been too weak for this world. Not to mention, I overthink a lot. And I don't open up to people. I hide my feelings a lot. And I'm scared. I'm really scared of this world. If I feel hurt when I have hurt people, or so worried and uncomfortable that I may have hurt someone, how can anyone just easily hurt anyone?

I.. am so tired of battling my own thoughts. Please help