Your observations of dutch being closer to English in some way than German, is correct. However, saying that Dutch is mix between German, English and French is quite wrong (disclaimer: I am not Dutch).

English, Dutch and German are all classified as western germanic languages, meaning they probably derived from a single ancestor language some time ago. Note that 'germanic' has nothing to do with German or Germany, a common misconception because the two words are similar in English.

Dutch is often more similar to English because German underwent the so called high german consonant shift (essentially changing t -> s or z, p -> pf and some others I think), in which Dutch and English didn't participate. There are some words that highlight this quite nicely:

  english   dutch    german

  appel     appel     apfel
  plough    ploeg     pflug
  better    beter     besser
  toth      tand      zahn