How to avoid doing things in last minute?

well, I think I always start doing things I have to do in last minute.
a lot of times, becuase of this, I missed the best timing or had barely enough time to complete my task, but still, I keep starting the things have to be done very late.

also, I...

think I know where my prob is. I am kinda completist, I am really afraid of making mistake, and I would take long time to badly regret what I ve done wrong. I
think this indeed terrified me to start sth up which could be
1. things I did wrong before, so this will remind me the bad experience I had before. I became dislike the task very much, despite the task is easy to do.
2. things in which I see a risk to mess up, so I refused to bear the risk of bring bad consequence to me by not doing it.
clearly, I know I have to finish them, but still, I alway escape from worry by doing sth else which can not help me out and run out my time.

I just made similar mistake yesterday, I feel depressed now, well, I think after describing the whole thing, I am bit of better off. it's good to have some place to tell sth annoying me.