Some people hit puberty later than others, there's really no way to tell, you just gotta wait it out. Smelling bad and acne aren't all it's cracked up to be, so i wouldn't worry...
You know when you start puberty when your voice gets deeper, you develop hair next to your penis. You can also tell when you start getting acne and the skin gets more oily.
If you're scared about your weight then you should talk to your GP about this. He or she will be able to tell you whether you do weigh too much for your weight (according to averages) or whether your...
calm yourself, take deep breaths. think how many people would hear u if u screamed. make a bold dash to the lamp and turn it on. turn on the radio, sit in the corner so u can see everything around u....
Talk to a friend, or family members. Possibly listen to your favourite music, watch your favourite movie. Dont think about anything that you are scared of.