to be lost?

Is it normal to have 85 things going on in your head at all times?  It seems like every time I say to myself "Evie it's time to buckle down and study", I find other things I can do.  It's like my mind fights with itself saying do what you WANT to do not what you SHOULD do! So frustrating I just wonder if anyone else feels the same.  It makes me feel like a slacker.  Because of course, you know at the last minute when things HAVE to be done, you freak out to get them done....Why do I do that to myself?