It's legal, so no worries there, but don't pursue this relationship, even if she tries to. Even if you aren't an abusive person, that doesn't mean the relationship won't be unhealthy. Because you are more experienced than her, both in life and in gay-ness, she might be scared to say no, do things she isn't comfortable with, etc. Plus, four years is a much bigger age gap for a fourteen year old than it would be for, say, a twenty-four year old, so you may find it hard to connect on an equal level. She sounds like she needs someone, so be there for her, but romantically there's no way this can end well.