Fainting... Is it normal if it happens frequently?

I remember when I was a kid I often fainted or lost consciousness. It happened when I was in a crowded area or when I was slightly feverish or feel something painful in my body. I'd just feel cold, numb, light-headed, my vision would become fuzzy and then I'd black out. I already lost track on how many times it happened coz I stopped counting after the 10th time. Is it something to be worried about? It still happens up to this day but I do not blackout anymore as I'm too used to it already I know what to do to stay conscious while it passes. It's painful though...