My horse was almost the same way:)
I just started small. Little jumps that my horse could easily step over with something scary underneath (flowers, or anything you have that is still safe). Then I walked her over it until she was completely comfortable (even bored with it) then I progressively trotted and cantered over it with a firm but forgiving hand. It took awhile but she started to not care and be taken by surprise by the different jumps.
I even put scary things around the ring to season her with every type of distraction. As long as its safe and you take it easy, it should get better:)
I know this really is not what you asked by this way your horse can get more used to it (hopefully) and you both can have a better ride!
Also, to make your horse a bit more confident in the ring (not necessarily at shows) I would usually just trot her around to get a glimpse of the jumps. Hopefully it will help him feel more confident and forward to the jumps.