Gf (27F) does not enjoying drinking with me (27M). Seems to enjoy with friends, flatmates, apparently everyone else.

Gf of 2 months likes drinking, and does often with close friends, flatmates, etc. When we make a plan to drink (her plan really) she just ends up taking a drink or two and stops. Says can’t get in the mood. She does have a great capacity and often drinks a lot with friends and all, to the point of getting drunk. It makes me feel left out and awkward, and makes me feel that she does not trust me enough, or feel comfortable with me enough (we do regularly get intimate though). How to approach this?