How do i get straight hair without a straightening iron?

My hair is VERY thick and curly.I try conditioner,leave it in a little bit(since conditioner promotes curls),and it still has curls when wet.I use the blow dryer with a round brush and it just seems to shrink and it doesn't really move as i shake my head,it just stays their,and it get all thick and poofy... show more My hair is VERY thick and curly.I try conditioner,leave it in a little bit(since conditioner promotes curls),and it still has curls when wet.I use the blow dryer with a round brush and it just seems to shrink and it doesn't really move as i shake my head,it just stays their,and it get all thick and poofy again.PLEASE HELP
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