Carrie, You're adorable.

There is no limit on questions!
I think you learn to get comfortable with it by trying it out over and over again. The more experience you have with feeling happy, the less troubling it will be. Consider it like a phobia. You're phobic of being happy. How do you fix that? You expose yourself to it a little at a time.
As for how to stop cutting, if you cut even when you're happy- maybe think of it in terms of this instead: you cut when you are not comfortable with your emotions. That way it's less of a blanket statement that "I cut no matter how I feel" and more of an acknowledgement of what's really happening "I cut when I'm not feeling comfortable or safe"
Does that help any? If not, do tell me and I'll churn things around in my brain and pop out some more ideas!
BTW, I'm really glad you started this thread because it has helped me figure some things out about me...
*hugs*
Angela