Pronounciation

It's quite difficult to pronounce the words would and wood for me. everyone says "pardon?" whenever I say the words would or wood. When someone doesn't understand would or wood even though I said it many times, in the end I say the spelling. Especially my pronounce of wood seems very funny for English people, everyone bursts into laughter when I say"wood". No matter how long it takes, I would like to be able to proper pronounce "wood" like English people.