Here's my third riddle today, and ever. This might be a bit more tricky than my last one, but I can't wait to see what you come up with.
I limit your movement, yet without me you'd not walk.
If you ever are without me, be careful of that lock!
Being in my absence both will and won't be stressful,
You might be embarassed if you ever prove me successful.
Good luck faking me, many will try.
Now riddle me this: What am I?
Hints will be added if you need them, good luck.