Emotionally unavailable?

Hey y’all, I’ve always had a glow app just to track my period but I never knew there were groups with girls my age going through the same issues as me. I’m 16! So dating is kind of a norm. I’ve been hurt mentally in all of my past relationships and now I feel like I can’t love anyone or trust anyone. I know I’m young but when guys tell me they want to get to know me and they want to show me they care I just can’t believe it. I can’t allow myself to like anyone because in the back of my head I know they will hurt me. Is that bad?

Ever since I’ve been hurt my standards have been so high so whenever someone fucks up, I’m quick to leave. I just don’t know what to do because I don’t want this mindset to have a negative affect on me.