Most people you pissed off probably aren't worried about it. Not being dismissive here, but most of them probably don't care. They more than likely have better things to do than dwell on some guy hurting their feelings.
Even though an apology shows that you are mature enough now to see what you did wrong, you would probably have been better off just leaving the forums for a minth or two, without saying anything, and just coming back and acting normal.
Also, doesn't this belong in drama?