What should I do about this girl?

My cousins friend likes me. I knew her for 6 years, shes 14 and im 17. She flirts with me everytime i visit my cousins house. Shes a cute guyanese/spanish girl, i dont like her like that but if i could i would date her im not a pedophile but she doesnt even look younger than me shes very physically mature, but i do know my boundaries which i can control. The problem is she flirts with me and teases me and sometimes when were in the kitchen together she grabs my ass and she leans on me...instead of saying anything i ignore it because i dont want to get her sent home and in trouble. Most of the time she does little things so its no big deal but sometimes she sits on me or kisses my cheek which makes me very uncomfortable. She also gets mad at me when i talk to other girl on fb. She goes in the bathroom and cries and then ignores me for the rest of the day or goes to sleep. I want to apologize sometimes but were not dating so it wouldnt make sense. I dont know why shes crying i mean i dont want her to be in love with me because then i'll feel guilty and and like a bad person. How do i make her not like me while not ruining our friendship?

Well shy guy, all I can tell you is that this is your calling card to maturity. Even though you yourself are only a kid, she is also. She is so innocently not realising what is obvious to the rest of the world, that it makes me chuckle. But at the same time I don't believe that you're treating her with the right amount indifference that you should be considering you feel 'uncomfortable' with her attentions. You have to realise that at this age (14) she is going to get excited by any male attention, it's called puberty. So you have to be strong Cassanova! You might find her a 'hotty' but it will only lead to problems, don't go there! I think the best thing to do is to make yourself scarce when she is around and to stop loving the attention from her (which is really what I think is going on here) because it will get you into trouble. You are probably giving her the wrong idea (in her mind). Be careful