You are 25 and you really like this girl but the only problem is shes 16 nearly 17 is that ok?

No it's not fine. She is a 16 year old child! Her mind, image, decisions are going to change a lot. She doesn't know what she wants and you are sick for chasing after her. You are 25 for crying out loud. Find a girl your age. One that may act your age. You're one year short of being a pedophile.... disgusting.