I don't feel like my feelings are as strong as my girlfriend's. What should I do in this situation?

My girl is much more emotionally attached to me than vice versa. This is my first real relationship, and I don't feel like my feelings can be described as "love" or anything like that. Of course, I like her; she is cute and beautiful, but I think I was always more interested in the sexual aspect of our relationship, and reality just hit me when she started telling me, "I love you." Whenever she says this, I always say, "I love you too" or "Me too," but it rubs me the wrong way when I say that, as if I am lying. I feel like experiencing true love is too early for me. What am I supposed to do in this situation? I don't want to break her heart because she is pure and innocent. I think I am just unsure of my feelings for her.

I don't feel like my feelings are as strong as my girlfriend's. What should I do in this situation?
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