Is 19 too young to have a bf?

My whole family sees me as innocent and pure, but little did they know, I've been in a relationship and have made out a few times. I'm still a virgin though, and I want to stay one for as long as I can. The thing is, I feel TERRIBLY guilty about having a boyfriend and I don't know why. I don't feel innocent anymore and am so scared I'll make a mistake and go too far. Please help! This has been preoccupying my mind and the guilt won't go away.
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Is it bad if I only told one parent?
Is 19 too young to have a bf?
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