How to stop songs from skipping on iphone 5?

I have an iphone 5 and when i listen to music, it would skip a lot of songs and when i look at my song list it would say i have the song but when i tap on the song it would go directly to the next song on my ipod i have the same songs but it doesn't skip.

Well there should be like a little button that is two arrows crossing each other? And you click on that. I was having the same problem till I did it by accident one day haha, but that should help.