My girlfriend treats me like an option?

My girlfriend and I have been together for almost a year, she is smart beautiful, but the truth is I don't feel appreciated it's like when she wants to see me I must drop everything and come see her and if I don't it's a problem and when I want to see her and she don't want to see me if I insist she says I am selfish, she says she wants her space and when I give her that she accusses me of cheating , she says I am heartless and that we are drifting apart. She would call me to come by her in the nights and hurry me out in the morning, and when I speak to her about it she gets upset, in my opinion she treats me like a boy toy I don't know if because of the fact I am 13 years younger than her , I honestly want to leave, the funny thing is she professes to me about how much she loves me but the reality is I don't feel love and appreciated, what must I do?
My girlfriend treats me like an option?
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