That IS small. BUT only for a fully-grown adult. I'm guessing that you don't have pubic hair either? You're just a late-bloomer (don't know why we always refer to "late" guys as flowers
I never "bloomed"
..... I'm an idiot...). Although you are fine for now, expect alot of growth in the next years. If not (if you're in your 20s and only 2 inches) you would be considered to have a "micropenis" (up to and under 2" DON'T WORRY FOR ADULTS ONLY). Hope I didn't worry you too much there... gotta learn to keep my big old mouth shut