Need help with Credit card?

I am 19 years old and I just got a Secured credit card from Capitol One. I pay a $50 refundable down payment and with that it gives me a $200 credit line. I am new to credit cards and I just wanted to get something clarified. If my line is $200, does my line not reset until I pay it? So say I have used $180 of my line, until I pay it off i only have $20 credit right?