Forcing myself to do things

So when I have some task to do and I know that i NEED to do that, I start to force myself but it makes me feel even worse. I’m feeling so anxious and tired bc of the pressure i put on myself and I don’t know what to do. I have my finals soon, but i can’t even start preparing, I think “why it is easy for them, but so hard for me?” and I feel so different. I'm starting to feel the gap between me and others even more. And the words "just try to do it" sound like going to the final boss on the 1 level without a weapon.