It takes a lot of thinking and time to figure out these things (in most cases).
However, mediation is a great way to speed up this process.
Just sit down somewhere quiet, get comfortable, and clear your mind. Keep your mind clear for a while and then start thinking about your sexuality and path in life. Ponder over everything you can and continue until you feel you've got an answer.
You may do this once and discover everything, or maybe you'll have so much to think about that you'll come to it again and again.