Changing board

Hi guys! I have been surfing for one year already, but making big pauses. I surf only at weekends, so my surfing level isn't too high. I am 5'90ft tall and weight 154 lb. I am surfing with a 6'8 that is quite big.. I wanted to move to a shortboard, maybe a 6'3 - 6'1. I surfed yesterday with a 6'4 and I went more or less, standed up in the board but wasn't able to stay up there for long. I want to start surfing again, but my 6'8 doesn't motivate me alot since it's almost a boat and I can't maneuver it, so I was thinking in getting a smaller board. I know it will be rough in the beggining, but I believe I can get the hang of it.
You guys recommend me getting which board? Should I buy a used one? Thanks!
You guys recommend me getting which board? Should I buy a used one? Thanks!
