What if your scared to jump to the high bar at gymnastics?

You may have a coach spot you, or if that is not possible, practice swinging on a single high bar or on a high bar over a pit to get used to being up high. Then you may set the high bar a bit lower or stack mats under it and see if that helps you. If having the coach stand there is possible, that would be the best solution. In a case like this, sometimes it helps to just suck it up and try. Remember that no one would ask you to do it if you weren't able.