Try to make a lot of cuts to the basket. Also wen u have the ball, see if there is anyone behind your defender for help because if there isnt you can make a quick move and drive to the basket and hopefully score or get fouled
first at ur size and weight i think u should work on ur speed and get quicker with that comes that first step which has to b quick to get by ur defender if the lane is open take it if not develop a mid range jumper.
If you are not faster than your defender it will be very hard to drive past him. Try pump faking and then driving.
I am small. yet i can drive. I am slow. yet i can drive. i am a pointgaurd. yet i can drive. What ya need 2 do is be confident and strengthen ur core and overall bodystrenght. u need to strategize as well