Hey, Bob.

Yes, most petal picks are going to produce a sharp metallic sound.  Your best bet is to try some standard picks that are typically made of some form of plastic (celluloid, delrin) or nylon.  The thinner the pick the less of a sharp attack & those are better for strumming in general.  The thicker picks are less likely to bend and so are good for picking individual notes.  So, some of your choice should be informed by what you intend to do, what kind of music, what kind of techniques.  Most students stick with a standard .75mm to 1mm plastic pick for a good balance of playability.

I encourage you to visit a local music store & ask to try a few.  Some places sell a variety pack so you can inexpensively get an assortment to experiment with.  And they are typically so inexpensive that it's worth buying a dozen to see what suits your playing best.

Hope that helps.