This is the FeedValidator report on your feed:
http://www.feedvalidator.org/check.cgi?url=http%3A%2F%2Fwww.yourtruelife.org%2Fa udioitunes.xml
Line 31: your URL has spaces in it it - this is not allowed (in any URL, not just in a feed). This is true of all your media files. You need to rename your media files without the spaces, re-upload them, and amend the feed to match. (Alternatively you could replace each space in the URL in the feed with the code %20 but I would advise removing the spaces altogether - you could replace them with underscores).
Line 32: the 'guid' tag must be unique for each episode - iTunes will ignore repeated guid tags. You should put the file URL in this tag for each episode.
Line 33: your 'itunes:duration' tag is empty. It should contain the duration of the episode in the format h:mm:ss e.g. 0:25:33 - this applies to all your 'itunes:duration' tags.
Line 61: the 'length' attribute within the 'enclosure' tag does not have the closing double quotes, and should not be followed by the duration. The number should be the file size in bytes.
Line 65: I don't think there is actually an error here.
You can ignore the remaining three errors, except that you may care to include the tag
<itunes:explicit>no</itune:explicit> to confirm that it contains no strong language or sexual references.
This page shows you a basic sample feed you can use to see what you should be doing:
http://www.wilmut.org.uk/pc
