As a Christian, I don't think you should follow the Bible just because you're told to. I don't think you should have to go to church every Sunday. I don't think you should embrace something you don't accept. Does that make sense? You can't be a Christian if you don't earnestly believe some things. Because of this, if you don't believe in those things, there's nothing wrong with saying "No. I don't believe this." or "No, I don't accept this." That's not something other people can decide for you. So, no, I don't think you should just because you have pressure to. I think if you decide to confess faith in Christianity, it needs to be genuine faith, and you shouldn't feel shame for not having that faith at this point.
However, remember, though I think you do, that your family loves you, and they only really want what they think is best for you. Have you explained your situation for them? Perhaps that you need some time or some space sometimes? That you don't want to lose friends? That they make you feel uncomfortable when they pressure you about these things? If you haven't, maybe that would help. If you have, I honestly recommend you talk to the pastor/priest/reverend about it, and see if he can't help them express how you feel. You can't be "guilted" into Christianity. It doesn't and shouldn't work that way, either.
Good luck working things out. Also, I just realize that you're probably going to a Catholic Church, since Saturday was mentioned as the day you go to church. I don't know too much about Catholicism, honestly, but I think you might want to try talking to the priest to help clear your head. If you tell him you don't want to be guilted or pressured into converting, I don't think he would put that pressure on you (If he does, you may want to consider a different church or something), and a priest can make a pretty decent guidance counselor sometimes.
Anyways, like I said, talking to people can help clear things up, but if you feel like it's making things worse, try talking to some sort of guidance figure a little bit, just to clear your head. I mentioned a priest, but I really meant any sort of person in a position like that. A guidance counselor, a psychiatrist, a priest, there's lots of options out there, and it helps when the person you talk to isn't directly involved, too.