I think my sister molested me?

When i was 5 and she was 11 or 12 i remember her me. I remember she was on top of me moving up and down. And i liked the way it felt. It wasn't like we were both dressed. I kept trying to kiss her i think but she kept saying no. Is that molestation? idk. Idk if i should tell anyone. It was more then ten years ago. And idk if she even remembers. When she was 15 or 16 i remember she called me in her room and she was wearing a skirt. She looked really horny ( i didnt know what horny was then but looking back on it she was all sweaty and one of her eyes was like rolling into the back of her head) She sat with her legs open and she didn't have underwear on and i think she was showing me on purpose but it didn't go further then that. Then another time when i was 14 she kept calling me to come to her room. I was ignoring her. She came out and she was wearing panties and a super tight shirt. She looked horny again (the same way she looked before) but i asked her what really rude and she was like "You know what just forget it" So idk what she was gonna say. But i keep wondering if she was gonna offer me . Idk what is wrong with me. Should i tell someone about this? Keep it to myself? I feel like shiit thinking about it.