I need some serious woman advice please. I DON'T want to lose my girlfriend?

Hello All. I have been dating this girl for 3 months now and I really like her. I am at the point where I am falling in love with her. Here is the problem I think. At the end of every text I send her I say have a great day and I will be thinking of you. Well, when she responds to my text she never says I am thinking of you too. She does say it once in a great while and what I mean by that is once every 2 or 3 weeks but not all of the time. I want to know is it just me am I crazy. Does this mean she is not into me as much as I am into her. I also always call her baby, honey and sweetie but she never says those words to me. She did say to me when we first started dating that she doesn't express herself that well. She said she likes me and is looking forward to see where this relationship can go. I am ready to move forward all of the way where she wants to take things slow. I am in 6th gear and it feels like she is in 2nd gear. Please help ladies. Is there a problem in this relationship or am I just an insecure moron. Please help me. Thank you