I understand that being average is okay; however, it is no excuse not to work up to your potential. You have to be consistent, faithful, and diligent with everything you do. You should push yourself when working, exercising, or doing something that requires your attention and effort.
You have to set small, attainable goals for yourself and then work hard to achieve them. Every time you accomplish a goal, you need to set the bar a little higher. Then, do it again, and the next time, set the bar a little higher back, still. You keep doing this until all your goals have been met, and you will see how far you can go.