Why are my fingernails clear?

So, I grew out my natural nails because I can't stand fake ones. I used to be a nail-bitter, and then stopped chewing. Like I said, I grew out my nails, and now they are about half an inch away from my fingertip. They are clear also, and very flimsy. Is this natural, or do I need to add something to my diet to gain healthier and stronger nails? Is it because of my biting them? Thanks for your nice answers :D