I'm 16 and I used to be pregnant.
At least once every couple of days, someone posts or writes into Scarleteen reporting that vaginal entry -- usually intercourse or manual vaginal sex, and usually (but not always) with male partners -- is painful, uncomfortable, or unfulfilling for them. Whatever sort of vaginal entry we're talking about -- with fingers, a penis or a dildo, with partners of any gender -- not only doesn't have to be painful, it really shouldn't be. More than that, any kind of sex shouldn't be about a lack of pain, but about the presence of pleasure.
Puberty: we hear everybody talking about it, attributing everything from the development of breasts, the desire for sex or you being in a crap mood on Tuesday to it, but what is it, really?
I remember when I was seventeen, I tried on some new ideas. One of my ideas was that notions of "right" and "wrong" were false creations of society, and did not actually exist. Yeah, it didn't make much sense back then, either.
The next time anyone tells you that only losers masturbate, or that they don't, and never would, bear this in mind: according to most studies and surveys, about 95% of adults have masturbated or continue to do so. Were many falsehoods and misconceptions about masturbation true, it would mean that 95 out of every 100 people would be blind, drooling psychopaths with hair on their palms and shrunken genitals.