I am 14 years old and I don't exactly know if I have hit puberty but all I know is my semen is whitish clear, brownish hair growing around the penis, my penis is about 3.6 meters in erection and I am in middle school so that I know boys are still hitting it but I doubt it cause all of my friends that are boys have the deepest voices I have almost ever heard.
You are in puberty if you can ejaculate. Whitish clear semen is normal and you have pubic hair too.
Your voice will change when it's ready. We all develop at different rates/times.
Hope it helps.