Be confident that each attempt you will make will improve your skills and increase your strength. While waging the internal battle between pleasure and pain, you must decide your long term goals. If you pleasure seek for only what feels good, you'll probably avoid most of the experiences that feel bad. The danger therein is that even a little bit of effort begins to feel bad, with the consequence that you avoid doing anything that requires any intense work whatsoever. The work ethic may seem like an unpleasant choice, but in the long run, the rewards from your efforts are felt as a pure victory.
Great achievements demand great efforts, and nothing worth having comes easy.
If it did, then everyone would have it at no cost. You must sacrifice laziness, pain avoidance, and pleasure seeking to develop the pain tolerance for hard work. Hard work helps ensure that your sustained efforts will lead you in the direction of achievement. Realistically, you must battle against fear, apathy and pain avoidance to defeat your worst enemy - most likely yourself. If you're intimidated by the thought of adding more weight to the bar when you can if fact safely handle it, you aren't tapping into your true physical potential.