Feelings for second cousin ...help?

Hi.. I have this cousin (dunno the degree exactly but she is my fathers cousins daughter). I just met her once , which was 4 yrs back at a relatives place and I wasn't aware of her being my cousin until recently. We have been talking online from last 4 yrs usually once a month or something, but from last 4-5 months we have been talking like 3-4 hrs everyday and its like an addiction. I have developed some sort of feelings for her. I have dropped hints suggesting about the feelings several times in the conversations .We do live in different continents and now that I know that she is my cousin I am not sure what to do about it . I have told her that I like to talk to her and am addicted and she said its the same with her. I am not sure where is this heading and dunno if she feels the same way.Am 22 and she is 20. How bad is it to have such feelings for a cousin ? Also should I let her know about these feelings ?