If your "riding" (ridding is something else) and horse's progress is going no where, you don't need to be showing, it won't be much fun anyways. I will tell you this right now, get a coach & a instructor, the best you can afford. It will be the best money you ever spent and then you will be going somewhere, I guarantee it! I have spent over 40 years with horses, showing, training, riding, you name it, through all of it, I had instruction, coaches, clinics, trainers. When I felt I was stagnant, it was time to move on to another level of instructor.
As for your mom not helping you out & going to shows, that's too bad but if you get the training & help you need, you won't require her help. Sometimes coaches go with you to shows. My current coach does, worth every penny. Until you make the change to gain further knowledge & skills in your equestrian endeavors, don't worry about going places with your horse & your mom.
The advice I & others have posted here is not to make you feel inadequate, it is to tell you there is a better way and how to avoid the frustration you are feeling. I want everyone out there to enjoy their horse pursuits & goals to the max! I want the horse industry booming!!