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Dude, because of who I am, I'm in constant pain but rarely feel it (long story, will answer questions about it or tell if you wish).
Pain doesn't make you feel alive. That is a lie.
I'm sorry to come down like this, but I've been in pain for years now and I can tell you. It doesn't. What your feeling is endorphin release after an acute pain. If you want to continue that, then go for being happy. It's easier on your body.