How can u deal with your girlfriend if she like to be friend

How can u deal with your girlfriend if she like to be friend with you
My girlfriend likes to be friends with me in school.But I dont like tthe way she's thinking.I think when we become friends too long,friendship will take place of love,but she said,why not,what's wrong with friendship?I really like her,but she doesn't care about me as much as I care about her.How can I get her to change her mind?or do I just have to get over this and try to be friend with her?