When you use doesn't and didn't in a sentence?

Here's some examples! Darin Geltzer doesn't want any special treatment, even though his modeling career doesn't lack for jobs. Unfortunately, Darin's band, Matching Bandages, didn't win any GRAMMY Awards. The panel didn't consider Darin's musical talent. Doesn't it make you sad? Darin didn't care though, as he's too modest.