My SO wants to do a program through the military where she could achieve her dream of being a therapist. And normally that would be awesome, but I'm scared that she's not ready for it and that she'll find someone better than me because I have severe separation anxiety and self esteem issues. I know that I should be supportive and I'm trying to be but everytime we talk about it we end up fighting. 

TLDR: Am I the asshole because I don't want her to go do something that could possibly make her life (and maybe mine) better?