I'm 18 and secretly hope for failing contraception
Are you serious about this?
If I'd have a child I don't know how I would raise a child and I'm nowhere near being a responsible person to have a child.
It sounds like you are not ready to be a parent, so you shouldn't want your contraception to fail. While there are many options available if you do become pregnant, it is bed if you practice safe sex for now.
It's fine. I'm ready for somebody else to take care of my child and school right now.
You are being irresponsible right now. Bringing a child into this world is filled with responsibilities that an 18 year old is unequipped to handle.