I personally prefer a mature responsible master. I dont think u just go out and find the right person , at 19 I was no where near mature enough to know my own wants and needs. You may try starting with an older partner but I knew at 15 that i liked pain and being dominated but was yet. I wish you the best of luck Sirnot secure enough in my sexuality yet to dare tell anyone. So I believe there are subs your age they just may not know themselves