Sure, I think it's okay to talk to her about it in the spirit of openness and honesty, all those kinds of things - good things. I've expressed my inner doubts to a girlfriend in the past and was quite surprised at the reassuring response I received. Don't end the relationship too soon Peen, just the mere fact that she's with you tells me she likes you. I understand, though - it's common insecurity. Pick a nice time and tell her you'd like to talk with her. Good on you Peen, you're doing well. All the best.