Girlfriend says that she can only squirt if I can get deep enough, which I am not able to

I (24m) asked my girlfriend (24f) how she was able to squirt in the past and she said if it was deep enough she would squirt. I’ve never made her squirt everytime we’ve had sex (I’ve only known her for 4 months). She basically implied that I’m not big enough to make her squirt (I’m 5 inches to be exact and I think that’s average). She was very quiet after and I was too, this was during a 2 hour drive. I’m not sure how to take this knowing that I can’t fully satisfy her and also knowing that she’s definitely had way better sex than me.