Simon,
It seems like you have a lot to sort out with your urges right now. The best advice I have for you is to look around online, here and on gay.com like Chuck suggested. I know we have plenty of people to answer questions along with threads about countless experiences. The second site....well I'm just going to guess they have some stuff there as well
Once you get more comfortable and can talk through things, then maybe pursue meeting up with someone or going out to a gay bar. You sound like you have a strong drive to just experiment, and once you think you're ready for it....then I'd suggest that you do it. Until that point, you'll never know for sure what you really want in life.
Also, you said you've been acting the straight life. On average, when walking down the street who catches your eye more often...give like a %girls/%guys split if that makes it easier.
