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.
You aren’t ever going to run out of things to do. Literally - there will never come a time when everything you could do is done. Some tasks are projects that have a beginning and end, others don’t, they are ongoing work. But in any case there is always more you could do, more than you will be able to do.
Write a list, if you are afraid you will forget. I put reminders in my phone too. Prioritize your list, do the more urgent or important things.