swimming, diving, tennis, volleyball, cross country, track, dance, tumbling, horse back riding, yoga, archery, indoor rock climbing, martial arts, golf, color guard, rowing.
I would recommend horseback riding because it is so much fun and you can start at any age. And it is a sport you can continue doing even once you're an adult. The only bad thing about it is that it's a bit expensive.
I started up tennis, and I grew to really like the sport and community
I would start with the least competitive sport at your high school. (The team that doesn't ALWAYS win.) otherwise....Track might be fun and easy to get into.
Volleyball or tennis
Girls should be acctive too! Why not try volleyball and badminton? it was easy and active game. Try chess too. In our country we girls do play basketball.
Softball really fun and good experience
Swimming, running, cycling, triathlon, cricket, tennis, netball, your choice as long as you enjoy it :)