Are you aware that you have several bodies, not just the physical form you see in the mirror? Here are parts 8 and 9 of the video series How to Meditate. Both videos explains the astral body and how you can do astral travel. Some really good information is shared here.
How to meditate part 8
YouTube has a limit on how long a video can be, which I believe the limit is up to ten minutes. So this second video is only about 3 minutes in length, but finishes talking about the astral body that they were unable to get into the video above due to YouTubes policy.