It is possible that girls and woman also have such thoughts. There's no need to feel guilty about it if you are. Its normal at your age, especially if you are seeing sexually explicit content, inhibiting your sexuality, curbing your sexual desires or your hormones might be disturbed.
Next Steps
You can self masturbate and/or find a partner for having safe sex. Physical exercise, gym, active sporting activities also helps reduce sexual overdrive. Distract your mind towards meaningful activities.