Straight christan parents w/lgbt children.?

Wow, this is my problem too. I am bi-ual and I like girls a lot. I was raised by my devoted Christian grandparents and being thought that LGBT is a sin. I don't really know what to do. I kept this secret for several years now and only my best friend knows about this. I have no plan in telling them about this cause I don't want to disappoint and break their heart. Actually, our family is a very strong Christian so, i feel like I will be a disgrace to them if I will come out. I think I'm just going to suck this up until I move out and be on my own. In that way,I can live my life with them as peaceful as it can be. I don't wanna cause them heartache. So, i think you just have to suck it up and get a timing. Tell them when you are ready to hear and accept what ever your parents want to say to you.