Thats pretty normal, your probably comparing youself to much better riders and then thinking 'im never gonna do that' and then sort of quitting in your mind before youve started. All youve gotta do it build up to whatever move gradually just doing similar but smaller stuff and once you can do it youll just think its shit because its so easy then itll all start again. I get that too, now i try and wait until my wheel is really fked before doing drop gaps whioh is gash because dropgaps are the best