Why does my roommate (girl) want to wrestle with me all the time?

Even though she's already 19 years old, she provokes me and pokes me on a daily basis. Isn't that childish? I need to defend myself and that's why I wrestle her down and humiliate her. I never let her win (of course), yet she keeps provoking me over and over again. Why is she addicted to wrestling? Isn't she a bit too old to do that? Shouldn't she be more mature? I once told her to grow up and she just giggled at me. It pissed me off. She loses badly every single time but that doesn't stop her from being annoying. Why is that?
Why does my roommate (girl) want to wrestle with me all the time?
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