What Abstinence Is
To make a long story short, abstinence (also called celibacy) means different things to different people. For most, it means that a person is not having sexual intercourse. However, people define sexual intercourse differently, too: Some people consider anal and oral sex to be sexual intercourse, while other people don't. What matters most is that you know your own definition of abstinence and communicate it clearly to your partner.
What Abstinence Isn't
Abstinence isn't limited to people who are very religious or scared of sex. It's a choice like any other. And you can be a sexual person and an abstinent person at the same time.
You can practice it whether you're straight, gay or bi, and you get to decide your own reasons for doing it. For some people, these reasons are moral or religious, for others they have to do with preventing pregnancy or sexually transmitted diseases (STDs). Lots of people are abstinent simply because they want to make sure they're ready for all of the emotions and responsibility that go along with being sexually active.
Abstinence is the only 100% effective form of birth control and the only way you can guarantee you won't catch an STD.
If you aren't a virgin you can still choose abstinence with pride, you are not a hypocrite if you say yes one time and no another, even if it is to the same person.
Having sex is a big deal and abstaining from sex is more than acceptable. Despite what rumors and gossip may suggest, virgins are a majority in most high schools, not a minority.
If you kiss sombody passionately or get into heavy fooling around this does not mean that you have to go all the way and it does not make you a tease.
Intimacy takes many forms, intercourse is not the only or best way to show somebody the depth of you feelings. Don't let anybody tell you otherwise.