I wish there was a moderator option of 'misinformed' but there's not, so I'm just going to reply.
You're not taxed twice (unless you started a corp for some reason). I've been a contractor for over a decade. My effective federal income tax rate was 15% and around 18% if you tossed in self employment tax (SS) and the like. (I'm not actually sure on the numbers, but know it was ~19% total). So hardly 30-40%.
I don't have a family, but my personal health insurance costs me $180 a month. That's a 10k deductible but I'm more than living with thinking that insurance is for unexpected things I can't afford and am happy to pay for the things I can out of pocket (besides, the insurance is a 100% write off and anything I spend cash for is a write off 7.5% of my AGI. Except I've never spent that much).
You also get those little benefits (if like me) you use your home to work, etc. Where you get to write off portions of your rent, utilities, phone bills, internet bills, etc.
And then there's section 179 where you can write off (most) recent tech purchases at 100%, or at whatever percent you use them. And yeah.