i havent took any theory classes

Learn some basic theory and apply it to you practice. Seriously.. you might think you "know all the basics" but if you don't know any theory at all then you are missing out on so much.. more than you think..

Here's a link to the new Beginners Course Level 2.. It starts off with the very important topic of Intervals..
http://www.guitartricks.com/course.php?input=2

Move through the topics of the course at your own pace, you might be pleasantry surprised at how much you have missed out on, as I was, when you get a little bit of music theory under your belt.