Here are the proper labels for the treble C’s on a traditional acoustic (88 keys) piano. Even away from your piano, you can commit this to memory. Notice there are four C’s in the treble clef above middle C.
If you are using a keyboard with fewer than 88 keys, consult your owner’s manual to find middle C. Then sing the pitch middle C to help you remember how it sounds and where it is.
How many keys are on your piano?