Excellent question! I've asked myself that question, so here are some of my answers.

I've felt that no matter what, I will always be faithful and attracted to the RCC. It's just been a part of my life, of who I am, ever since I was born. It's just a part of me that I can't shut down or get rid of.
I find peace, solace, and fulfillment in the Church. The Church offers me a place to go to, and with being a teen, it can be hard. I won't want to talk to parents, friends, family, but God and the Church is there. I think that's amazing.
Don't get me wrong, I have wanted to leave the Church before. Yet, when I would look at other churches, and even though they had truth, they didn't have the full Truth. Things would be missing or not explained, and so I would always return to the Church and be happy that I'm a part of it.
The Church has helped me grow and become the person who I am, and I am eager to get Confirmed in October. I feel that I'm Catholic because the Church has the same feelings and values I do. But honestly, there's no clear answer. I think it's an answer so deep in my soul only God knows why.

Ben :-)

my great grandma kept telling me and my mom that she wanted us to convert but we never did until we just decided to do it and I was reluctant at first but now I cant get enough of it!
-Hannah

I've recently gotten more fired up by God's spirit and just got back into our Catholic faith again, and not too long ago, I had these revelations (I'm not using the prophetic type but the personal "I think God told me in his own special way that only I could understand) that I might be called to be a nun. And I don't think any other Christian denomination has nuns so I thought I'd put in my 2 cents.