Hi!
Forget all the written simbols! Start again and try to memorize the sound of the letters, not the dots and dashes.
There are many free PC programs in the web to practice on your own. You will hear some dots and dashes and you'll have to identify the letter. The initial speed is very low and it increases as you progress.
Don't practice one day for 5 hours and then leave it for one week. It's better to practice 20 minutes everyday. In a few weeks you will have got the knack of it.
Take it easy!