[header] How to tell if you have hit puberty (boys ) [title] See if you have more body odor. [step] Your hormones affect your sweat glands, which can lead you to smell a bit more and to smell differently. If you have a change in your body odor, then it may be time to start wearing deodorant if you aren't doing so already. 
You may also need to shower more often to keep your body feeling fresh and smelling clean. [title] Check for an increase in the size of your testicles.