My boobs are so small that covering the nipples makes then almost invisible, I won’t bother anyone with these.

You're way too modest. It's not the size but the shape. ;)

It's good that you don't burn easily. Some do, even at our high latitudes. Why?

Let's look at this this way. Your latitude is about 62 degrees north. It's almost summer solstice in the northern hemisphere. The Earth's axial tilt is 23.5 degrees. On the equator, the sun is at the zenith (as high in the sky as it can be) during the spring and autumn equinoxes at midday. It is never lower than 90-23.5 = 67.5 degrees at midday at any time of the year, so the midday solar altitude varies between 90 and 67.5 degrees on the equator.

At summer solstice, the solar altitude where you live is 90-62+23.5 = 51.5 degrees. The power of the solar radiation that reaches the surface is roughly sin(51.5) = 78% of what it would be if the sun were at the zenith. It is quite powerful and people who tend to burn easily are wise to limit their exposure or use a sunscreen lotion or stay in the shade.