Do I really have to be baptized?

i wasn't baptized as a baby, and now i'm 14 and my friends and i were talking about baptism the other day. my one friend said that i can't get married in a church until i've been baptized. but the thing is, i don't really want to be baptized. i am a believer of Jesus Christ, i just don't feel it's necessary to pronounce it to the world, or at least my family and friends. but my question is: do i really have to be baptized? can i still have a minister (oh my God, i seriously think i just got that wrong. i have no idea what they're called!! i'm so pathetic. but hey, i'm only 14) at my wedding? thank you so much! OH! and if i do get baptized, what will i have to do beforehand? will i have to go to classes to learn about Jesus Christ before? and will they ask me questions before being baptized? thank you!(: