It's difficult to diagnose an illness without seeing the patient!
My guess is that you are aiming at speed rather than clarity and security. Slow practice will help you to memorise and hear the notes accurately, and speed should be worked up in short phrases only at first. If you attempt to play whole passages up to tempo you may be trying to run before you have learned to walk.
Pay good attention to the left hand when it is acting in an "accompanying" role. This will provide the solid foundation that the intricacies of the right hand part require to build on. Work out the "hand-groups" in such figures as bars 13-15 and make sure that the hand (assisted by a free lateral movement of the arm) is comfortably over them. In the left hand figure which begins the agitato do not make a sideways "jab" at the bottom note but let your wrist turn so that the fifth finger is securely over it in this and other similar figures.
Try practicing the downward rushing figure in the coda in different rhytmical groupings, with the accents falling every 4 quavers, then every 6 then on the first and third beats of each bar. Then try bringing out the single notes, f# c# d a# etc.
I hope these suggestions are useful, but no amount of words can replace the trained eye and ear of a good teacher!"
chopin scherzo 1