It's okay! go out right now and buy a new one, then don't do anything!
Don't repot- don't mess with it- just put it in your sunniest location, water it the way you think you should (every 4-8 days depending on the plant, its pot and your house) and keep notes- as soon as you notice anything even slightly wonky, come here, post a picture and tell us what you did that lead up to it- then we can save it
We'll get you're house looking like a greenhouse in no time- nobody gets it right on their first try without help...