Although it's not intercourse, oral sex is a part of sex--and like any sexual act, it is something you should not participate in unless you are absolutely sure that you want to. Some girls want to remain virgins and think of oral sex as a way to be intimate without intercourse.
Virgin or not, the real issue is being comfortable with your decision every time you participate in sexual intimacy. Each experience is a new choice, and your actions always deserve thought and attention.