Good I'm glad you have decided to go back to church, I hope it helps you to revive your faith. I recommend taking some time to find the right church for you. There are many kinds out there and not all will be helpful for you and some are just not good at all. Look into what different churches in your area believe and do as much as you can before you go, via the internet, it will make your search easier. If you get a chance read any literature they have out and talk to the Pastor or any other people there about any questions you have. Don't feel you have to stick to the first one you visit.

On to your main question: do not come out to your Pastor. Find a church and Pastor who is a good fit for you before you even contemplate this. Even after you get to know your Pastor and become comfortable at your new congregation I would still highly recommend not doing it. Like Dakota said Pastors are people too and I would not come out to one any more than a friend. If you feel you must then use the same reasons you would or would not come out to a friend rather than assuming that just because he is a Pastor that he would treat you well. It sounds to me like you are thinking walking into a new church for the first time and before you even meet anyone telling the Pastor your greatest secret. Why would you want to do that?

Your Brother in Christ,
Godspell