Am i being selfish as a guy or is something really wrong here?

I understand why your upset but I would suggest putting yourself in the parents shoes and if you had a teenage daughter going over to guys house wouldn't that make you nervous.. she is just being a good daughter and your lucky to have a gf like her there are not many like her in this world... Im not saying you had bad intention but things to happen when 2 people get together alone... so the parents are just looking out after her.... I would suggest maybe inviting her and her parents over for dinner a couple of times so they can see who you are and see that you are a good person.... it will take time but I would say its sooooooooooooooo worth it for her...