Situations

In many situations I have experienced first stages of OBE and when that happens it seems to be easy to get the vibrations or the tingling electric wave through out my body, but sometimes when that happens I get excited and try as hard as I can to get out and then when I´m not out for a a while when the vibrations are there I get frustrated and nothing happens.  Sometimes I just let the vibrations continue and be relaxed but then they fade away and nothing happens, that is very frustrating. In most cases when I´m very aware of my surroundings, my body and the vibrations something interrupts me physically, like watery mouth, itch somewhere witch seems to have in most cases a bad influence when trying to have OBE or Astral Projection.  I asked someone in some forum why this happens and the response was "You got an ego problem", I did not understand it then and I don´t understand it now.  Maybe I´m just so eager to get out that something interrupts me.