It's not that people make decisions for you. It's just that when you reach the age of "discernment" (I think that's somewhere near the correct terminology), which is usually early teens, you are asked if you really want to be a Catholic, and if so you take classes and prepare to announce your decision, your confirmation of your faith, in a ceremony before the people of your church (or, as in most cases, a packed house of teary relatives armed with cameras and congratulations cards!). It's just like parents would raise a kid in the family faith in any other religion, it's just got a few extra steps added in with infant baptism. Confirmation is like when you are baptized older in many Protestant churches. Really, it's not all that dissimilar. Catholicism just has a lot of dogmatic explanations.
So in conclusion, yes, your parents make the decision to raise you Catholic, the same way Lutheran parents raise their kids Lutheran or Jewish parents raise their kids Jewish. But it is required of a practicing Catholic at a certain age to step in front of the congregation and announce their willing committment to the Body of Christ, the Church. YOU make that decision.
As far as other religions...I feel called to my faith life as a Catholic. I am very active in Youth Ministry at my church, participating in leadership and service events and ministering to younger teens going through the Confirmation process. I have always felt comfortable as a Catholic. I believe in the Consecration, and I have great admiration for Mary. I enjoy celebrating Mass with my family and friends. Truly, it is a gathering about community. I have friends of many different religions, and while I have great respect for them all, I have never felt the same calling or enthusiasm about any other religion. I apply my Catholic faith to my worldview (which means that I'm a liberal...). I am Catholic, it is a major part of my identity, and although I've struggled with my faith before, I always wind up more dedicated to the Church...although she could do with some REFORM.
PEACE AND LOVE.