self worth

Today my softball coach had a talk with us and the baseball players.. and it was like girls hold yourself to a higher standerd and don't put your self down for boys and stuff like that and it got to me really bad.. I flirt with a lot of guys kinda sexually ig and I can't help it I know I'm only in 8th grade but the guy I want don't want me unless that's what I do and I feel like that's the only way someone is going to want me. I just want to feel loved and have a guys attention and be able to say anything and be myself but I just cantttt and it hurts... so bad I want to have sex but I'm too young and I feel like I shouldn't want to. I feel worthless.. opinions please...