Am i getting better

I've been playing chess for about 4-5 years after a good friend of minds introduced me to the game. I feel as though i have gotten better, but at the same time i make the same mistakes in some of my games over and over again, this is really frustrating. After studying and analyzing games over and over i still cannot tell if my  game is truelly improving. The games i play offline with friends i havent noticed any significant difference as far winning and losing goes. Anyone have an oppinion