It's not very easy to hook a conventional drilled ball without altering how you approach the line and throw the ball, but some can do it. For the rest, that's what fingertip grip is for. It's very common to be all over the place when you don't use your thumb, but usually the people I see doing this also have enough speed to keep it from over hooking. Since you're young you may not have the strength to not use your thumb and still get the ball down the lane far enough. If you're not going to use your thumb, there is the option of bowling two-handed, but odds are you will become much better using your thumb with a fingertip grip over time.
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