Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
Some people find comfort in labeling themselves bisexual, and some people do not. Don't feel like you have to put pressure on yourself to date a girl or kiss a girl just because you like her. When the time is right, things will fall into place.
For now, if being with a girl makes you feel jittery, then don't be with a girl. As you get older you may want to try dating girls, but if that doesn't feel right right now then no worries! The important thing to know is you are not alone, and you are in control of your body. Check back if you ever need anything, sweetheart. Hang in there!