Concentrate on you're game - while playing don't think of stuff like what she was wearing last night etc.
Practice - both, improving technique and skill if you're not one of the "gifted"
Try you're best - Give 100% because I don't believe in stuff like 110%.
Don't smoke - It's bad, it's not gonne help you!
Education - it comes first, (even though it's last on my list)
As it's for a "young" cricketer, this is my best advice, please take it friendly-ly.