I understand your opinion that you will be able to cope with everything by yourself, but it is the horse that will be paying for your mistakes - with unwanted behaviour, health problems, and in other ways. For example - the reason why he just trots faster and does not go into canter might be because you have your weight shifted too much on his forequarters, even if the cues you give are correct. In that way he simply is not able to rise in canter, because his forequarters are blocked (correct canter begins in his hindquarters and with natural collection). And, being forced to go faster and faster while all the weight on forequarters (which can result in a nasty fall, if there happens to be something wrong with the terrain), he will most probably hollow his back and carry you in a way that will eventually harm his spine.
I have come a long way, to surrender my shadow to the shadow of my horse.