Signed, Horny Dear Horny, Masturbating two or three times per week is well within the normal range. It is also normal for men, including young men, to feel horny all the time, and to have sexual fantasies. Horniness can increase or decrease when under stress, and also when inundated by stimuli, including memories or desires. When you get erections in class, there are ways of remaining discreet. Alice is sure that you already have a few tricks.
Erections are a reaction to a sexual signal.
Often, if you think about something asexual, or something that is a total turn-off, like your next exam, you can lose your erection. Think about specific ways of discharging some of your sexual energy, such as masturbating more frequently. In terms of the woman you have a crush on, try talking with her. Sometimes, by acting on your feelings, you can put this looming sexual energy into perspective.