Exhausted from fighting the flesh

Christians only please!! As a F who is not even 25 yet, I am exhausted with this fight of sexual purity. Does anyone have biblical advice other than getting married, for someone struggling to maintain abstinence? My flesh wants sex, I dont want to want it because I know it would be sin outside of marriage, but im slowly feeling like my fall is going to be inevitable. I need some sort of encouragement in scripture if you can help. Even if you've messed up in your abstinence, how did you continue? Like, just genuinely looking for people to be honest about the fleeing of sexual sin.