How can you tell if you hit puberty? how do you know when you hit your growth spurt?

Aha! That famous ?: It really depends on gender and other variables! some are "early birds"... Developing early ... Breast budding, facial and armpit hair showing early while your classmates are "late bloomers" ... Short scrawny kids that develop after 15 yrs or later! lots of changes, liking opposite sex , voice cracking. Needing to spray tons of axe perfume in guys ;) & make ups in girls too! enjoy life !