I can see why you're hurt.
I could never, ever, ever get the right present for my ex. he has a birthday in the winter as well as Christmas. It was hell because he would be such a shit about it sometimes (and when I did "ok" he would be tepidly accepting rather than effusively grateful)
I am really looking forward to being single this year and enjoying presents only for people I love who will be grateful! (Ok I'll have to think of somethings for from the dcs but I personally am off the hook.)
It's perhaps too soon to tell at 6 months, but the question is: when you know each other better, will this problem go away or get worse?
"go away" = you will fall into a groove of mostly naturally buying each other great presents and being lovely and enthusiastic about them - with occasional slight mis-fires which are lovingly accepted or gently exchanged, with kindness and consideration
"get worse" = every present buying situation is a gauntlet of anxiety, shame and ridicule to be run, where you agonise, second guess, over spend in desperation , and then suffer torments afterwards when he is unkind and ungrateful
Do you have any inkling which way this is going to go?
Are there other instances of him taking your time, thought and affection for granted?
Is he generally arrogant? and does he show you respect in other ways?
Is he a good listener?