Uh I'm not pro or anything, but identifying mistakes would probably help my game as well.
First of all you shouldn't give her your number, she should give you hers.
Your always supposed to hold yourself in equal or higher standard.
Also this may be just me, but I like to talk/type with perfect punctuation and grammar when it comes to conversing with girls, it makes you seem more intelligent and well spoken.
Thirdly from your conversation it's just been small talk, and you were basically asking her boring typical questions. The "we should chill sometime" was a huge killer for you, it should have been, "well it was nice to come in contact with you, next time I go out you should tag along

".
Next time try and sound more well spoken, cut the basic small talk after a few minutes, move towards something more intimate (to some degree, no sexting) and cut it off at a high note, and leave her wanting more.

Good luck, just my two cents. I'm having trouble with HB 8s+, but I have no issue with 8-, stupid shyness and anxiety (sweat and mumbling).