Have I been sexually abused by my sister?

Recently I think a repressed memory of mine has came back.. I'm 17, but I recently came across a memory from when I was very young, maybe 10 years ago. I remember my sister asking me if I wanted to play "amusement parks". She had her legs straddled and had me sit between them and rubbed me up and down on her. This happened for a few days until she had me turn around and kept moving me up and down but instead had my legs in the air or straddled apart like hers. I've always had a strained relationship with her, she's verbally abusive, but this just makes me feel even more hatred towards her. I just don't know what to make of this memory.
Have I been sexually abused by my sister?
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