You are definitely not crazy, although it is possible that this has been something that has been present for a long time or progressing gradually and that you are just noticing now. Each of us has a different color to our skin, and in some of us the color is more translucent and allows the veins to show through more distinctly or prominently. This is not usually a significant medical problem, although there are at least two things that are worth thinking about, as I explain below.
First of all, depending on your age, prominent veins may become noticeable. This is because in middle age, the skin starts to thin out as a normal part of the aging process. This can lead to more noticeable veins under the skin. It is important to avoid sun damage to the skin, as this will accelerate this process.
Second, there are some medications that can cause accelerated thinning of the skin and lead to vein prominence. In particular steroid medications are the most common offender here, so if you are taking steroids this is definitely something you will want to talk to your doctor
about. Also, rarely, the body itself produces too many steroids, something call Cushing syndrome, which your doctor can also rule out.