Is it normal to feel this paranoid?

i used to get in alot of fights in my neighborhood a few years ago and i was never really scared or anything but now after every thing has calmed i have gotten very paranoid and feel weak. i want to go back to how i used to be but i feel paranoid and i have lost the energy i once had. i dont leave my house anymore more cause i feel any thing will destroy me. just wanting some opinions on this