Being able to see through to your scalp is very normal for people with your hair type, it’s difficult to diagnose with just pictures. Your hair strands are very straight and very coarse, but have low density (more space between each follicle). Plus you have light skin. I personally don’t think you’re balding.
One way to check is to find two mirrors, one wall-mounted with overhead lighting, and one handheld. Look into the handheld mirror at your reflection in the wall-mounted one, and tilt your head in several different directions so you can see every part of your head from the same angle under the heavy lighting conditions. If the density appears equal all over, your hair is in good shape.
