Other contributors have said "Does adolescence include activation of sexual development?" is the same question as "What factors influence my development during adolescence?" If you believe that these are not asking the same thing and should be answered differently, click here
What factors influence my development during adolescence?
Drugs, sleep, excersise. Those are the three main factors that change your development in puberty. Drugs slow or can stop the process while sleep and some excersise can help change your body size...