In love with a girl..?

i am engg. student..and have gud luks..i like a girl very much..we are friends..we some time talk in colg and cel..i want to tell her that i love her..but the problem is she is ONE year senior than me..if she rejected my propose then i will lose a good friend also...i dont want to lose her...do you think she will say no to me just because i am her junior...PLEASE HELP ME..!! wt shud i do..