I should tell you, I have met many, many people who have regretted quitting piano, but absolutely none who were happy to. If the housekeeper is telling you off, then tell the housekeeper off! And tell your mother to calm down and back off. How can you expect to become an accomplished pianist by being compared to other people? Everyone has their own pace, some quicker than others, but learning a piece or mastering a piece in a very short time is no measure of a musical pianist. If you want this, if you love music, then definitely continue with piano. Practice slowly and deliberately, study the score, miss no details, go over difficult passages in slow time, then speed up until it is good. Don't bother what housekeepers and others say, what do they know about music? Ask them to practice an instrument for ten years! Just be optimistic, prepare well and be confident in the knowledge that you have prepared for a pass, and you will get it. You can't take things too seriously in music, you have to have enjoyment or you will suffer. Try to remind yourself that you have the opportunity to play brilliant pieces of music that many others don't, and aim high with a smile.
Best wishes,
Camille