As the daughter of a lesbian and a gay man, I just wanted to tell you that your children will not resent you purely for your sexuality. Your ability to parent (I'm sure you know this but it should be said) is not impacted AT ALL by your sexuality.
Your kids are going to be ok. Life is getting so much easier for children of LGBT families. I saw a huge difference between my experience in school fifteen years ago and the experiences my sisters had over the last few years. Things are improving, slowly but surely.
*Please note - I probably don't need to tell you that your kids will be ok, but I know that most alternative families don't get much encouragement. I just wish someone would have told my mom that it would be ok when I was little.