I need help and advice

Okay so I'll get right into it, I've noticed the last like 4 times i went out with my bf even tho im excited to see him and he's in a really good mood every time, i find myself being very moody when we're together and hence acting as if im mad at him or something. I honestly don't like that and idk why it's happening to me! He's been supportive about it like trying to help but last night we called and he was very upset about it saying "i can't go out with you and always wonder and try to find what's the matter w you, i wanna have fun when i go out. I just feel that things aren't working out for u mostly and u need to figure this out" and he's right and im really willing to stop acting this way but idk how cause idk why i do it in the first place. Thank you so much if you made it till the end and id appreciate any kind of advice.