"Don’t stew about the futures."

[Odessa Dawn]

How to Stop Worrying and Start Living

Fundamental Facts you should know about worry
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If you want to avoid worry, do what Sir William Osler did: Live in "day-tight compartments." Don’t stew about the futures. Just live each day until bedtime.
1. If you want to avoid worry, do what Sir William Osler did: Live ... pdf free download

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Does "The futures" with s in here mean things that are going to happen to you not time to come?

I have checked the dictionary and found, "commodities or other financial products bought or sold at an agreed price for delivery at a specified future date See also financial futures"
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Definition of futures | Collins English Dictionary

 

[probus]

I think you must have misheard it. The sentence is correct without the final s, and incorrect with it.

The definition of futures that you looked up refers to financial contracts in which people agree to buy and sell a commodity at a certain future time, but at a price that is fixed today by the contract. That, in my opinion, is the only legitimate use of futures.

 

[Raymott]

I don't think this is a misquote of Dale Carnegie's. You can find it elsewhere, eg. Reduce Worry by Living in ?Day-tight Compartments? | The Official Blog of Dale Carnegie Training of Central & Southern New Jersey
It could actually mean financial futures in the original context.

Or it could be an unusual use of the plural of 'future'. I have to disagree with probus on plural 'futures':
"Do you worry about your children's futures?"