Visit lots of bike shops until you find a shop (and owner/employees) that you feel comfortable with. Then test ride all the bikes the owner suggests and buy the one that "speaks" to you.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.