IME virtually all horses can go on slow relaxing trail rides, but not all riders can
If you want the horse slow and relaxed on trails, then you need to ride him slow and relaxed. That might mean being strategic about picking who you go riding with. If you head out with company that wants to go blasting off at a canter, yes your horse is going to want to follow, and if you try to check him he will fuss. Every horse will do that.
Go trail riding with folks who respect your current limits, who are willing to walk and to trot just as much as you feel comfortable with, and who don’t shame you into galloping because you are “ruining their ride” otherwise.
If your trails rides are calm, big forward walk and medium trot, and you do not train your horse to expect to gallop, he will learn that trail rides are calm and quiet. If you go out with rowdies and risk takers who want to hot rod around, your horse will learn that’s what’s expected of him.
When I was a teen we had “cantering stretches” in our routine. As we approached, my pony would start to cavort and prance, and I encouraged her a little bit to impress the locals. Then we would “bomb” up the trail, until she’d used up some of that energy. Then we would have a nice quiet ride because that was the expectation on other trails.
As a returning rider, now that I’m trailering out to trail systems to ride, I’ve only been doing walk/trot. I’ve been going out with friends who have less experience trail riding than me, and taking care of them. I am in no real hurry to “bomb” flat out on the trail systems. I am not riding, period, with anyone who would try to insist that I do so, on anything other than my own timeline.
My teen self would not be pleased with my middle aged self, but my middle aged self thinks it’s fantastic and amazing that I am riding at all, and that I am riding out of the arena to boot so all is good.
Picking your riding companions is job number one.