I'm 17 passed my test last month. First thing I would say is dont go out in your own car. The reason why you are continually stalling it is probably because your instructors car is diesel with a big engine, your own one is probably a little petrol motor, A LOT harder to drive. When you pass your test you can try to get to grips with petrols as believe me the clutch is far more difficult on them. Your mum also might be teaching you bad habits from years of driving.
So in my opinion avoid that. Just keep with the instructor. In the grand scheme of things you havent actually been learning all that long anyway. I ended up having 40 lessons over about 6 months. Keep it up for another while.
And I was the same as you, near the end of my lessons i was still making lots of mistakes, I was sure I would fail my test but I passed it with 2 minors... dont think anyone ever feels ready. Just about concentration and really how lucky you are on the day, a huge part of the driving test is luck IMO...
So just keep it up and you'll definitely get there, dont worry about your mistakes just try and learn from them. I absolutely hated learning to drive too but we've all got to do it...