What are the different types of grappling?

Also, im 17 and im interested in the sport of grappling. am I too old to want to take lessons in grappling whether it be jiu jitsu or any other type of grappling? Id like to say im naturally okay at it. I do it with my buddies and dad and I always beat them. My dads almost 100 pounds heavier than me and I still slap on the submission and reverse him. I dont want to do anything with striking. I just find grappling fascinating. I also am going to college to be a police officer so theyll be teachin me hand to hand combat/grappling. Please, only answers from people who know the topic relatively well. Thanks.