Don't waste your energy in hostility toward others. Accept and live with your own decisions. The sooner you start, the sooner you'll be free to do other activities, the less worry you'll experience, the more time you'll have to recover from mistakes and wrong directions. Expect a certain amount of tension. Use that tension as energy to get yourself moving.
Different people have different styles of working.
For example, some people need competition to do their best, while others work better at their own pace. Respect your work style and arrange the conditions you need to do well. If you have a long, hard task, make it as comfortable for you as possible. Give yourself a pep talk. Completed tasks keep interest and motivation at a higher level.