My parents separated when i was really young and my dad was barely around anymore is that were my fear of abandonment stems from?

I find it a common trigger to anxiety. You want a stable household with both parents contributing to your formative years. Loss of one whether by divorce/separation/death can plant the seed of anxiety. If one why not both gone? For really young kids its also a matter of where will I get food/sleep/who will care for me. I encourage parents in split homes to discuss custodial (just in case) plans

That could be a contributing factor along with whatever else may have happened to you in your interactions with others while growing up. To understand yourself better pleases see a Clinical Psychologist with expertise in multiple types of psychotherapy.