No matter whether you are good or bad, a Horse Archer does not deserve to live
long.
Horse Archers are the most annoying class, closely followed by Horse Crossbowmen.
Learn to play melee, it is way more fun
After all playing a mounted Archer does not make you learn melee either. I too started cRPG fairly late (About a year ago). Loads of Pros running around while I did literally just know how to move using WASD.
Many people had to go through tedious times of being mercilessly slain by some tryhards, play lots of DTV, the bots are easier to block than most players (Provided there are not 50 bots ganking you at the same time)
Or hop on EU3/NA3 and find someone who practices with you, there are always helpful people around. (Go to Battle or Siege, ask if someone can help practice on Duel and I am sure someone will.