I'm sorry you're feeling this way - and even if you are a Christian, does not mean you are perfect. You're allowed to have mixed feelings and emotions and it's important to know that it IS ok. I see you're upset about your family not coming to your daughter's baptism, but you don't become a Christian for other people, you don't live a Christian life for other people, so the fact that they won't be there - although is upsetting for you - I think the fact that you'll be there to start this path with your daughter is more important. Isn't it better for her to have someone who shares your same beliefs in your corner? As you and she become stronger in your faith, you'll be able to "deal" with your family with more confidence... good luck and make sure you tell your daughter that as much as you (and she?) want your other family there, this walk with God that you're about to take is yours and His - not theirs, so it's not as important to them to be there as it is for you!
"Twenty years from now you will be more disappointed
by the things you didn't do than by the ones you did do."
-- MARK TWAIN