What should i do about this girl?

been hanging out with this girl...went to the movies twice and mini golfing. i paid for all three. i am intereste din her but havent asked her out cuz i dont wana ask to early. we went to the movie and got dairy queen on wed. had a fun time and she asked when the last gf i had was. we planed on fireworks on monday. now shes saying she doesnt feel a click between us and that i act like i dont want to hang out with her....what should i do? i do like her....i told her i like hanging out with her i just get nervous...should i ask her to dinner? what should i say to her to lether know i do enjoy hanging out with her