How to avoid sexual desires? (i'm a girl)
We all have sexual desires and there is no way to completely stop them. There is nothing wrong with sexual desire as long as it does not cause you to sin. If your sexual desire is difficult to manage, you can weaken it with fasting or dieting. You can also google “how to reduce libido” to find more suggestions.
From an Islamic perspective, the closer you are to God, the easier it is to avoid sins and obey Him. For advice on making it easier to avoid sins, please see my answers Islamic Strategies for Escaping a Sinful Life and God has not abandoned you.