Why do you want to become Catholic? That's what the priest (and your parents) will ask you, and if you can't tell us here or formulate a good argument in your own mind before you embark, you're not going to have much luck swaying anyone to take your choice very seriously. I was brought up Catholic by parents who converted later in life (but before I was born). My mother was a Southern Baptist. Her (Baptist and Protestant) family are all kinder and gentler and more loving than anyone I have EVER met in a Catholic church, but maybe that's just her family... Today, I can only see what is wrong with the Catholic church and I want nothing to do with it. But, that's my choice.
I wanted to convert to Judaism when I was 13 because many of my friends were Jewish and I just liked a lot more things about their faith (their knowledge of their religion, to begin with) than my own. While I admire many Jews, I'm glad I didn't do it. Today, I'm respectful of other people's religious affiliations/beliefs to an extent, but I am not a practicing member of any religion. That's my choice; I'm not saying it should be yours.
If you think this will hurt your "strong baptist" parents in some way, then your desire to convert begs the question, "Are you intentionally trying to hurt or punish them in some way?" If so, that is NO reason to convert. I think you should discuss it with them before you go running off to talk to a priest, who will be all too happy to rush you through the catechism classes and other formalities to take your allowance money every month.
You're young. Examine your options before you make any rash decisions. If you still want to be a Catholic, then call a Catholic church and make an appointment to talk to a priest. I imagine any priest counseling you will want your parents' consent. I hope so, anyway.