Be patient
You may have started karate because you want to spar. Or perhaps you have your sights on becoming a master. However, if you're just starting out, it’ll do well to exercise patience.
Like any sport, karate takes a lot of practice to master. You’ll need to train your brain and body to learn new physical movements.
If you're not improving as quickly as you'd like, give yourself time. Karate involves both physical and mental conditioning, so learning at a slower pace may actually help you retain mental aspects. Eventually, with practice, the moves will begin to feel natural.