Help Please!!!

My gun shoots by itself sometimes, when I don't clcik it or push any other buttons....

I had hacks when it happened, but it happens even if I don't have hacks. What is going on?????

It has shot until i ran out of ammo, and when I switched to a knife/other gun it didn't help! It always gives me away in quarantine so please help me!!!!!!

No, my computer is slow, but amazingly, it doesn't lag at all.