Do you need to be a good language learner to be a good language teacher?

I'll be honest I am a terrible language learner. Laziness, lack of motivation, frustration with lack of progress, etc. all add up to a real struggle, (by the way did I mention laziness?) Someone said to me recently I should try to learn Czech again so I can feel what it is like to learn a language, so I can relate to my students. Well, I think I can relate to my students, I know what it is like to learn a language, I know it is maddening, frustrating, time consuming, and not very rewarding. I know that the puddles of satisfaction are quickly swallowed by lakes of frustration. I can empathise with those who can't, not those that can.