what's the worst that could realistically happen if you fail your assignments? if you fail your course? if you aren't able to complete assignments at this stage perhaps it isn't the right time to go to uni-- you would struggle. maybe uni is what you want to do- maybe you need uni for what you want to do in the future-- don't worry, you will be where youre meant to be in due course.
lets say you fail- you can always retake the course youre doing and redo your assignments or go somewhere else and do something else- there's nothing wrong with that. I won't say everything will be okay because (having been in the same position) you wouldn't believe me anyways-- just know that you are more resilient than you think and that you can make failing the best thing that's ever happened to you. things will work out- maybe not in the way you want them to but they will