Girlfriend always moaning?

My girlfriend lately seems to just moan. And it's starting to irritate! I try and try to empathise with her but it never works, she moans about work, her family, just everything. We don't see eachither sometimes very often because she works, and the last time we could see eachither I said no because I wasn't feeling well.. we talk texting everyday and that who, e week she was off with me, because of that she didn't get to see me, not mentioning the fact the rest of the time we couldn't see eachither because she was working. She doesn't drive, so to asks me for lifts (which I didn't mind) but she seems to even expect them off me. This might seem petty but I don't see what she brings to the relationship... I don't expect things, but not once has she bought me anyhting except my birthday, I lay more pretty much everything when we are out. Today again she's moaning, I try and help, I ask her again how she's feeling, she says the same... we were due to go out tonight but now I be cancelled because I really cannot be bothered after a day of moaning from her I feel like why should I? Maybe I'm being insensitive? Now she's gone all off with me again... when she cancels on me I don't moan, I never moan to her, I always try to be upbeat about everything but it's starting to wear.
Do you think I'm over reacting here?
Girlfriend always moaning?
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