I'm 13 and I think I'm in love with my 17 year old sister

I'm 13-year-old male, I just turned 13 last week, and I'm not sure how to feel.<br><br>I have a sister who is 17 years old and for a very long time I really liked the look of her. She's got the most gorgeous looks I've ever seen in a person. She's tall, slender, and has long red hair. Whenever I saw her I always felt something in my stomach.<br><br>I never told her how I felt, but on my birthday she gave me a gift. It was a really nice watch. She kissed my cheek and I just looked at her in shock. And after that, I have to admit that I masturbated to the thought of being naked in bed with her. I felt so bad after that, and I wondered if I'm just a sick person. I already know what incest is, and I felt guilty since my birthday. I also felt like I'm betraying her and doing something wrong.<br><br>I'm not sure if I can or even should tell her how I feel, or if I should just keep it bottled up forever. She's very kind and I don't want to surprise her with this. I don't want to ruin our relationship because of my feelings.<br><br>Should I keep it hidden forever, or should I tell her? She's very kind and I'm not sure if she will accept it or not. She's never said anything to me about dating her, she just says no when men ask her out.<br><br>I'm not sure what to do. This is my first time feeling this way and I don't want to do anything to make her hate me.