I'm olive-skinned, but whenever I enter into the sun for 5 minutes, I'll get severely sunburned?

I have the same problem, except i am white as a sheet:)

I can't tell you how many times I've gotten sunburned over the years but I've found that products from the dermatologist don't work as well as they should. I also have extremely sensitive skin.

I use an SPF of 70 or more all the time. I recommend Neutrogena products (they have SPF's up to 110). That does the trick for me. Make sure to use an SPF of at least 40 every day, even if you're not planning to go in the sun that day.

Also, i was just recently at the Clinique counter, and the saleswoman told me that every sunscreen expires and looses its effectiveness after a year so make sure you throw out all your old sunscreens.

Another factor to your skin burning so easily might be any topical retinols you are using (that includes anything designed to help your skin turn over and/or regenerate) make you extremely sensitive to the sun. If you continue to burn even with the high SPF sunscreen on, discontinue the use of the retinol.