I'm jelous of my sister so I lashed out and called her something bad. HELP?!?

I'm not trying to be offensive, but maybe the reason you called her that is because you are so jealous of her. Would you do the same if you were in her place? Think about how you would feel if you were her. Would you want your sister calling you names?? NO, but if you loved her, you would forgive her. If she chooses to hate you for that, that is unfortunate but it is her choice. If you apologized, and explained how you felt and that you were jealous, maybe she would understand more. But after you do that, it's up to her how she responds. Let her have time to make up her mind how she feels about it so she can respond to you.