Welcome to the board! Many girls do not orgasm from intercourse. I started out the same way. I could orgasm from other things, but not intercourse. After a while of having sex I started to get more sensitive, and started orgasming during sex.
Have you tried different positions? Doggy style works good for me, or girl-on-top. That one allows the girl to angle herself in a way that feels good to her. Every girl is different, and some girls' vagina tilts forward, and some tilt backwards a bit. So the angle to acheive an orgasm is different for everyone.
There's also other products that help stimulate you. There are lubes, and stuff that have different sensations. I didn't care for the warming sensation, but some girls love it. You can get that stuff at Walmart, Target or any drug store.
After only having sex for a month, I doubt you have explored many positions. I would try that before buying anything. I think it's best to learn how to please eachother without the help of products first. Another thing that really helps me is foreplay. If he goes down on me first, I orgasm really easily. Good luck, and let us know how it goes!