Unfortunately you haven't posted your age or the age of your girlfriend and I'm assuming you're both very young. Love at this age (this being the case) can feel like it's the world to you but communication is such an important factor in a relationship.
The best advice I can offer is to talk to your girlfriend about this and don't keep assuming things or listening to others. She's the only one who can tell you if she truly loves you or not.
Perhaps she's unaware of exactly how you feel towards her. You need to talk.
