Struggling with Uni

I have been struggling with uni assignments and i don't know what to do? I don't know whether its me being autistic or I'm just lazy and a poor student. I've already received leniency with one assignment and i had a second one due today for the same module but i have already missed the deadline. I feel exhausted just looking at what i have written so far and i don't know how to continue. I feel like a complete failure and i know i need to get better coping mechanisms but i feel like i cant do that until i can start afresh.