Which one is it? 😞

Kind of confused. I'm a 21 year old female, and relationships I've had, never worked. Never been with someone for a year or longer. It always lasts a short period of time then we break up and I never hear from these people again. Now that I've been single for almost a year, I've been having time to myself to think...... But I'm having bad thoughts. I'm thinking no ONE I actually dated cared about nor does anyone really care about me now. (Besides family). I don't think none of the guys I've ever been with even thinks about me and I'm starting to think I'll never really be loved by a guy.......... am I going through an insecure stage, or am is it low self esteem??