Should I give up with this girl

Basically, should I give up with my crush? 6 months ago it was looking very promising. She was giving off signs and by best friend informed me that she liked me. Ok, I'm not perfect in this as I missed quite a few signs and that was my fault and should have taken faster action!

However, as I have got to know her better. She seems to act like quite a 'princess' at times and likes her own way in different situations and is quite easily upset over strange things, I have noticed.

I also brought this person a quite expensive birthday present, helped them go for drives after they passed driving, printed off things, brought the person coffee on numerous occasions. She always says thank-you and all of that but in return for Christmas, I got an unthoughtlas present in used wrapping paper. I know this person doesn't work and probably doesn't have much money and I don't expect or want anything 'expensive' but thought it was quite thoughtless.

I just got a horrible feeling this person has 2 sides to them. Seems to be all lovely to me but there's something not quite right. She might just be quiet, but it's quite hard keeping a conversation going as I'm the one asking all the questions and she answers and that's it.

Is it me overreacting or should I run!