As a woman, a teacher, and the mother of both boys AND girls I can tell you that often boys don't respect girls, because girls don't demand respect from them.
I know it can be lonely if a girl stands her ground and doesn't let a boy cross her boundaries of what she considers acceptable behavior, but giving into pressure to party/drink/engage in sensual and sexual activity only sends a message to the boys that you are only worth the image you are projecting.
Often, especially when women are young, they are attracted to the "bad boys" because they think it is exciting. However, these boys have already given you the message that they don't respect girls by the behavior they have exhibited...yet girls often walk into these relationships expecting to "change" the boys once they fall in love. It rarely happens that way.
There are well mannered boys out there who do respect women...but they may seem boring. I see these boys all the time...they are lonely too...because all the girls are off with the "popular" guys.