Guilt is a horrible thing. I think it causes a lot of upset and anger. However, if it is the guilt/ fear of upsetting your parents that is the only thing in your way, you still have a choice. Lets be clear, its not an easy choice and I am sure that you wouldn't want to have to make it but, you do have the choice.
This is one of lifes little problems. Quite often we feel trapped, like we "can't" do something. The truth can be though, that is fear stopping us, nothing else. Fear of guilt, fear of reprisal, fear of change. All of these thing haunt us, they stop us from just doing whatever the hell we like. However, and this is the really annoying bit, we need these fears, this guilt. Imagine a world without it, people would just cause chaos. (Think, The Purge but times 7 billion!)
I guess what I'm getting at is, it's normal to fear these problems. You do have choice in what you decide to do but, you will have to face your fears to do it.