special project

For my religion class, we had to come up with a project that would help us work on becoming more Christ-like. I chose to work on several things, including not making as many mean and/or sarcastic comments. I don't think my plan is working though. I still think all the things but I don't say them out loud. I think this is causing problems. You know how when you stuff your feelings and don't express them, they just grow and grow and grow and then you explode? Well, I think I'm about to starting spewing random comments. It'll be like I have Tourettes and in the middle of class I'll just randomly yell out "Your mom works it!" or "That's what she said!" or "Wow, that's just so interesting, I can't even contain myself." I'm thinking that for the well-being of everyone around me, I should probably find some outlet for my negativity. Any suggestions?