I dont think this is immature at all I did the same thing with my now ex-girlfriend we went out for almost a yearish, talked about sex and then did it when her parents werent home. I was 15 at the time so was she. Im now 16.
Dude just make sure you actually wanna lose it to her. If shes hot that helps too. Goodluck.
Dude just make sure you actually wanna lose it to her. If shes hot that helps too. Goodluck.