I have a horse that became jiggy for riding...she's very reactive and that seems to be how she worked out her nerves. She has come a long way in relaxing. We still have a long way to go but we did have a very successful trail ride on a windy day at the fall season last year. I know you can't completely change a horse's personality but I believe you can teach them to listen and be respectful. Your horse may get excited and there will be times you can allow some of that out and others where the horse will need to remain obedient when not permitted.
I have a buddy sour horse who has been tricky since I also have few to ride with but she has come a long way. She of course prefers to ride with others, but we have reached the point where we can ride, even around other horses though not riding together. Some days she has an off day like a couple weeks ago...we just stayed in the round pen and did exercises to keep her focused on me. My suggestion would be to work your horse on the ground before your trail ride. Then as you start your trail, do different exercises such as circling or whatever ones your horse enjoys but keeps the horse focused on you and less of the excitement with the other horses. When the horse relaxes, reward the horse with something he/she enjoys with the group. All the best to both of you!