100-115 isn't too bad. The normal is 60-100, and your pulse is not much above that. You should be concerned only if you feel your heart racing all of the time, have many palpitations, get pain in the chest, feel fatigued, and other symptoms you should not have on a daily basis.
And if you have an anxiety
disorder, it makes sense your pulse would be higher since anxiety is known to raise the pulse rate.
Like the person above said, everyone has different normals. My resting HR has been lower than 60, and since I am not having any symptoms with it, the doctors aren't too worried about it and neither am I.
If you are too concerned though, I would go see my physician and just have an EKG done or atleast a doctor tell you that it is okay for you to have a high rate. It might calm your nerves some.