It really gnaws at me when I cannot get a bouldering problem well within my abilities. Unlike running, biking, thru-hiking, backcountry skiing, and a significant amount of mountaineering there is no way to will myself through a blocker in climbing. Digging deep only gets you so far. You need the skills, the technique, the core strength, and the ability to move your body in precisely the right way to get up the wall. And you only get so many shots at a problem before a necessary part of your anatomy (muscles, tendons, skin) is worn out or used up; forcing you to walk away.
Having focused so long on activities where endurance and willpower are key to succeeding, it is quite frustrating to simply be incapable of pushing through a problem. Probably good for me to have an activity where slow, incremental development of technique and strength is the key to improving. Still. I almost punched the wall after the 20th time of not being able to get past a certain point on a v4 today.