recently i have discovered for the past 3 years i have been using the wrong grip on my double handed backhand. my right hand has been turned round like a single handed backhand grip instead of using an eastern forehand or a continental. Probably due to the fact i started out my tennis with a single hander, and the coach i am with now told me to have to hands on the racquet. Anyway due to my recent discovery i am a bit annoyed with my coach as he didnt correct this easy technical fault. i play at county level at u14 and this has mesed up my progression so much. He always told me my backhand was a solid shot but he didnt realise i was playing it the wrong way. i feel like a different player now and the court seems so much smaller. i like my coach and we have a good friendship but should i ditch him for this kind of error.