Yes, dont take any notice of what other people recommend. e.g. Airowear, Champion Cobra, Racesafe. All have their staunch supporters on this Board.
But you have to buy the bp that fits you properly.
Go and try some on, take time and trouble and ask the saddlers to order in your size if necessary. Then buy the one that fits you best. Being small wont be a problem. Most good bps come in child sizes.