Waiting for explanation

[al.1]

I can't find any clear explanation of the following difference between:

a) Nie moge czekac na ciebie.
b) Nie moge doczekac sie ciebie.

Dziek you za explanacje antycipcip.

[kwiatek_leona]

a) Nie moge czekac na ciebie. I can't wait for you (because I have no time)
b) Nie moge doczekac sie ciebie. I can't wait to see you (I am looking forward
to seeing you)

[mudzyn7]

I can not just repeat the longines when I'm gonna see you Kwiatuszku Leeona, just like that!

[kwiatek_leona]

Cmok!!!

[al.1]

O wielkie dzieki Kwiatku_leona.
Z wdziecznosci opowiem dowcip.

Daredvil to bungee staff: Could you tie the rope around my neck?
Bungee staff: ???
Daredevil: I hate to dive my head downwards.