Raise the bars up the stem don't start off with a really aggressive aero position.
also as said before straight flat quiet road to practice (your local supermarket car park after closing is a good one) and this is key ......relax
we have all been there it's a totally different feel to a road bike all of a sudden you will get it and before you know it you will be hammering downhills with no problems
Why do I keep getting ????????
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