freshman short rower problems, advice?

coming up on my second season as a rower, spring. im a female novice and im about 5’2” 125lbs. ive been feeling super discouraged about erg times, specifically because of my stroke length differences from my taller novice friends. i really love this sport and at the moment am not interested in coxing. any advice on how to build confidence? i know i have potential, im just having a hard time getting over the mental side of things. advice would be appreciated!!