That's a dads job. And since your dad was once a boy (Yes, back in ancient times) there is just a chance he reads any boy you bring home better than you think.
remove the bullets from dad's gun(s) before introducing them.
Try not to worry about it. If you get a boyfriend explain your concerns to him, and tell your dad likewise.
hide the shotgun
your dad won't always have the power he has now.! there will be a time when his demands and rules becomes an opinion.
Deal. 3 years to 18 is not a life sentence. Enjoy your childhood.
Don't you think it's kind of silly to worry over something that hasn't happened? Don't you have enough current things to worry about?