Since I began watching the show, I've generally been a bit happier than I used to be. I've also began dealing with some life problems better because of what the show has taught me. Certain episodes portray situations I've been in and that's what has helped me get through those situations so much better than the old me would have.
I've also began seeing myself as less of a weirdo. The episode where Pinkie Pie tried to befriend Cranky really makes me feel better about myself when it comes to how often I want to be left alone. At the end, where Pinkie explains that some friends like to play together, and others want to be alone just makes me happy knowing that there is a show out there that explains to people that just because someone wants to be alone, it doesn't mean they don't want friends. I've gotten both a close friend of mine and my mom to watch that episode, and I think it helped them understand me a bit better.
So yes. Being a Brony has helped me change as a person. Before I watched the show, I was sad and lonely all the time. Now I'm happy and I feel less singled out as an introvert.