How To Overcome Hatred For A Younger Step-Sibling

I hate my younger step sibling - how can I overcome this?

If you feel that you don't get on with a younger step sibling that's quite common. You're having to spend time with someone that you haven't personally chosen to spend time with and possibly live with someone that you haven't even met in the past. Things do change. Age gaps do sometimes make things more difficult because you're at very different stages and you might have reacted very differently to your parents splitting up or your two separate parents getting together. It's important to slowly take your time, get to know each other, and see what you've got in common and over the years that might change, but just accept that you're going through a very difficult situation, and you're having to come together at a time that you might not have chosen to do that.