I like to run my fingers through my hair and put any loose strands in my mouth. what is that about?

Hair eating: Putting your hair in your mouth isn't actually a bad thing except being a bit unhygienic unless you are actually eating your hair which is called trichophagia. This can create a hair ball in your stomach called a trichobezoar. This hair all can actually obstruct your intestines.

Nervousness?: You might not need to be too concerned but if this behavior continues you should seek professional help. A chronic pulling hair out and eating it called trichiphagy can lead to serious problems. Consult with your physician for steps to take.