I need help getting better at basketball because inconsistency?

ok basically ill drain like 10 in a row than miss 15, its ridiculous. Also, lately i have been having trouble finishing when i drive because i have people close on me any tips? Im a little guy like 5 foot 8 and 125 pounds. Im not really bad like i made sophmore as a freshman, but everyone expects me to be better than i am because my brother is amazing and made started varsity as a freshman and averaged 25 points as a freshman:/ so any help? im going into 10th grade next year