What should I do about my relationship?

I have been with my girlfriend for a few days less than a year and I've started realizing more lately that we don't exactly have the same personality. When we first started dating i felt it was because I asked her to prom and we talked for 2 weeks and we're going out but I notice that I can't really talk to her. We are long distance by about 7 hours and I text fine but talking on the phone is awkward and there are numerous awkward silences. When she is here I feel like I rush leaving back to my house because we have nothing really in common so I feel weird being with her when we mostly just sit in silence. I feel like we force some conversations but I don't know if this is good for a relationship. She is the sweetest girl but I just feel like she tries to act like nothing is awkward but it's quite obvious. She always says that we should work through things like this but I realize more that this issue is simply because we are different people. I just don't know if this is how I should be feeling with a person I should want to be with forever...