Even if they’re not difficult, they still feel like a burden, and I’m very worried that I won’t have time to do them or that I’ll forget about them. I either put them off but constantly think about them, or I try to get them done as quickly as possible and get very irritated when something prevents me from doing them. I can never relax if I have things to do, even if they’re not urgent; they’re still a pain in my ass. I don’t know why I feel this way, and I think this is the reason why I avoid difficulties and my life sucks so much.
Take your time to organize your tasks, then prioritize them. The decide what has actually such a low priority, that its fine if it doesn’t get done. Then, check how to split the task on time (not full 24/7, but actual work time) and see if it is realistic. If not, you need to communicate that you can’t realistically get it done in that time, and that you need to extend the time to get it done or delegate it to someone else.
Anything else would be unprofessional and not really helping the situation.