You need more confidence, which only comes with more practice. Not just blasting away on some backroad and hoping that you don't screw up and crash, but focused, repeated practice in a controlled environment.
Take the beginners MSF course, listen to them, and do what they suggest. And even afterwards, go to a parking lot and practice. Then practice some more. And maybe even a bit more. You didn't learn to ride your first bicycle in one day, did you? Nor did you learn how to ride the mountain bike anywhere near its full potential in a day or two.
Look for some of the better riding skills books. The Proficient Motorcycling series by David Hough will give you a good, basic foundation that will serve you well. Also look at Total Control by Lee Parks, A Twist of the Wrist I & II by Keith Code, and Sport Riding Techniques by Nick Ienatsch.
When you get a few more miles down and are feeling a little more confident, take the Experienced MSF course. And maybe look into some of the other training options out there. There are several schools that hold rider skills courses on a race track, but are not
"go as fast as you can" track days. There is a difference.
As for those pesky corners, the first thing you can do is slow down well before you get to the corner
. Don't wait until you're already there and have to hit the brakes hard, but plan it out much further and do it much smoother. The trick is to go in slow, roll in smoothly, and use the throttle to pull you out. If you even think about braking in the middle of a corner, then you've already done it wrong. Honest emergency maneuvers are excepted here of course, but if you're braking in almost every corner then you need to slow down and start reading the road better.
And don't stress too much about it. It'll get better, if you're willing to invest in yourself. Like I said, nobody gets it perfect without working hard at it.
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