Macbook Retina overheats very easily

My Macbook Retina overheats very easily, sometimes I'm just browsing the internet and using listen to music (Youtube or iTunes, doesn't matter which one it's still the same problem) and suddenly my battery goes from 100% to 90% in 5 minutes and my fans sound like a jet and the bottom of my laptop is really hot.

I've already tried an SMC reset and PRAM reset and that doesn't fix the problem. If the fans are too loud I find that if I close my laptop for a while (and it goes to sleep) it'll stop for a while but then when I use it, it'll start back up.

I've been using my laptop for just over a year.

OS X Yosemite Version 10.10

MacBook Pro (Retina, 13-inch, Early 2013)

Processor 2.6 GHz Intel Core i5

Memory 8 GB 1600 MHz DDR3

Graphics Intel HD Graphics 4000 1024 MB

I have 9.9 GB free out of 249.78 GB if that makes a difference.

Thanks.