Can someone help me reason?

I come from a very rough and tough family bloodline. My dad and brother will snap and kick the crap out of anyone for any arguably small reason. Personally, I've been sheltered. I'm muscular but never been in a fight.

So here's where I'm getting at. At the bar I go to, there's a guy whom I have reason to believe may try to hurt me (if you want details on that, please ask, but it's kinda long). I don't want to avoid the bar just because of him. I'm tempted to try to beat him up. I want to be like my bro and dad.

Please be honest with me. Is it a bad idea to get physical? My mind is clouded with anger and a desire to be tough like my family.