Are you still growing if not shaving yet?
Additionally, the age at which a boy begins to shave does not necessarily correlate with their overall physical development. Some boys may start shaving earlier than others but still be shorter or less physically mature. On the other hand, some boys may start shaving later than others but be relatively tall or physically mature.
In general, if you are concerned about your rate of growth or physical development, it is best to talk to a healthcare provider.