Is it normal for me to be constantly thinking about having sex, and being overall horny?

Yes: If you are a 16 year old boy this is completely normal. If you want to tune it down a bit try vigorous exercise and focus on other activities. Be sure to access thorough education about sex, pregnancy, STDs before you indulge your fantasies. Make sure you have had your HPV vaccine series, always use condoms and make sure you have the STD discussion and pregnancy discussion with your partner.

Yes: My colleagues have given you good advice. You can stay comfortable by jacking off. All your friends are doing it. You may even want to talk with Dad -- he may be smarter than he seems. Enjoy the new joys and responsibilities that go with your changing body