True, the two sound quite alike. A person might even find some dialects of English where they are identical. I pronounce "won't" as \ˈwōnt\, rhyming with "don't". I pronounce "want" as \ˈwənt\, rhyming with "front". See http://www.youtube.com/watch?v=E21Y867xQ58 . I hope this helps.

Небольшая разница в произношении все-таки есть :) Won't - произносится как [уэунт] - сорри за русскую транскрипцию, по-другому тут не напишешь... Тут дифтонг "эу/оу". Want - [уонт]. Краткий звук "о". Два разных звука. Так и отличать :)

Like many other words that have the same pronunciation, you distinguish one of the other according to the context, with that in mind it's easy to complete: I ... you to come. Why ... you come?

I won't = I will not = я не буду I want = я хочу