Ask HN (or a CPA): IC work questions

I have worked for a startup over the summer as an intern getting paid as an independent contractor. I was paid $1600 a month starting in June through August. All together I believe it's been $5,700.

This has been the only IC job I've had this year. I have no idea how to go about finding how much taxes I owe or how to pay them (I'm in South Carolina in the US.) I've heard so many things such as you might not have to pay anything to you owe 30% or I'm sorry we cost too much to worry about figuring this out for you.

I am a dependent under my parents and I'm sure that changes things too. I have no idea where to start. I would like to know how much money I actually do owe so I can pay it and not have it haunting the back of my mind. Any help or advice is appreciated.

This can double as a guide for newbies to this kind of work as well.