Important news from the future: use shade not sunscreen whenever possible. And, as long as you're not often getting peeling-levels of sunburn, don't fear the sun, or the feeling of the hot sun, so much.

Sun exposure is sufficiently correlated with so many health benefits that it is almost certainly causative for those benefits – especially lower rates of heart disease. Endogenous Vitamin-D production is just one mechanism/signal of the sun's influence, not the full story, so supplementation of Vitamin-D can't reproduce all the sun's benefits.

And, other than preventing sunburns, the health benefits of sunscreen are suspiciously under-proven, and the potential effects of long-term exposure-to/blood-absorption-of their ingredients under-studied. In another decade or two, the current levels of sunscreen use, and recommendation by expert bodies that should know better, will likely be considered a public health failure up there with "use margarine not butter" or "replace fats with sugars" or "masks don't help against respiratory epidemics".

Use shade not sunscreen whenever possible.