Why does my horse run away from me in the pasture

we are very fond he doesnt buck or bite or kick do i smell bad or something? Why is he like this?I have had him for over 9 years.

Here's the best way I know of to teach a horse to let you catch it easily.

I have worked with a wild mustang that had never been touched, and this method works on a scared horse. Putting the horse in a round pen is best, but you can also do this in a small corral. (I have done this in a pasture, as well, in the rain, wearing cowboy boots, and believe me, I had blisters on my feet afterwards! A smaller pen just makes less running around for you.)

Anyway, the main concept is teaching the horse where its "Safe" place is. Generally, a shy horse will feel safe anywhere away from you, and this method changes the horse's thinking so that her safe place is close to you. The way you do it is with body language. Having a halter rope, lariat, or flag stick in your hand is a good idea. Enter the pen where the horse is, and attempt to slowly walk up to the horse. When the horse turns to run, SPOOK the horse (with the mustang, all I did was scuff my boot in the dirt a little, and she JUMPED to the other side of the pen; a calmer horse, you may need to throw the end of the halter rope at her, or swish the whip at her to get her to run. Have her continue circling the pen, until she shows signs of wanting to stop and look at you or turn toward you. Any time she turns AWAY from you, you will scuff, throw, or swish at her to make her MOVE. In a sense, you are welcoming and friendly when she stops to look at you, or turns towards you. You are a scary wild person if she turns away from you.