Phasing

After finding out your powers don't work, you go to punch a wall, only when you do, your hand goes straight through it. After a few seconds, you realized what's happened, and try touching the wall, actually making contact this time, and then you manage to phase your hand again.

"What was that?" the man asks, having no clue what just happened. "I think I can alter my physical structure so I can pass through solid objects, let's see if it works in reverse." you say as you focus and try to alter yourself so you're structure is harder than the wall, which works, causing a small dent when you hit the wall, which is good since you didn't feel any pain and you didn't hit that hard. "This could be useful, you could get into high security places and if you're caught, become invulnerable." the man said to you.