I am able to have obe on a bi-monthly basis been hapining for about 5 years now. It is very clear when I leave my body, (it usally happens on week-ends when I sleep in) I get to the celing or walls and thats it I cant get past them but I clearly can tell I am out of my body against the celing looking around, only last for a few seconds then I get sucked back in and usally instanly wake up. So why cant I penetrate walls?

It hapened to me too !!!!

The only time I left my body I couldn't go thru my door so I figured that maybe I was just dreaming even if I felt myself move thru my body at first.

Well I discovered by talking to others that it IS your expectations that block you.

*sigh* I should be more serious about leaving my body...

Risking the fact of sounding cheesy, remember in the movie Ghost, when Patrick Swayze tried and tried to move the coin but he couldn't, he was trying to hard to move an object with his physical self, then when he let go and got upset he kicked a can and it went flying. 

Since the experience we feel while out of our bodies is very real, I think we have to remember that it is not our human self, and that our everyday rules do not apply.  Instead of trying to move and touch things with our physical arms and self, we need to move through walls, ect with our minds.  Letting go of everything that might be "normal" to us.  I almost had an OOBE last night, but the vibrations kept waking me up.  It felt as if the whole bed was going to shake.  I guess I would be able to help more if I could actually experience it!   
-MandyLynn