Should i become a cop?

I'd suggest the military if you are interested. There are lots of jobs that aren't going to require you to kill anyone and you can learn a lot (I did). But consider one of the services where it's the officers who do most all of the fighting, like the Navy or Air Force. Coast Guard might be good too. Never met a Coastie who didn't like it. You could then use your educational benefits to finish school when you get out. They won't care about the pot if you stop. But don't admit it to them either, could make it hard to get a security clearance, which you'll need unless you like mopping floors or peeling potatoes for a few years.