Youre not the only person with this issue, but if you havent already, i would ask your doctor for a referral to specialist gynaecologist. This is an extremely common problem which is still taboo and laughed about, which affects so many women who are too embarrassed to talk about it or go to the doctor.
I have had problems in the last few years, and I was referred to a specialist and showed how to do the exercises properly, and also was enrolled first in a modified pilates class, and now a modified circuit class. Im using the NHS squeezy app, which costs about £3 but its worth paying for as I just wasnt doing the exercises without it, and ive definitely improved a LOT since ive been doing it a few months now.
I also know its not nice, but are you overweight at all, because this massively affects our pelvic floor sometimes, and if you keep to a healthy weight, it puts a lot of pressure on your pelvic floor.
Unofrtunately some exercises will make it worse, and you cant do these jumping exercises. Youre going to have to tell your instructor that you have been advised not to do these high impact exercises because of a medical problem. Whether you tell the truth is up to you, but i actually did pluck up the courage to tell my gym induction bloke, and was a bit embarrassed, but he didnt bat an eye, and advised me which ones to avoid. No squats. No running, no jumping, no lifting heavy weights. There is no way around this at the moment. If you continue, you will make the problem worse. Its a shame, because I actually loved running, but it turns out that could well have exacerbated it for me, so now i do cross trainer instead, or fast walking on an incline.
If you speak to a specialist, they will be able to help you. Please dont think you have to suffer, and please dont carry on doing exercises which will make it worse. You do not want that to happen. Youll have to modify what you do