Under UserCP>Edit Options>Messaging & Notification there is a box (second one down in that section) that says:
When you post a new thread, or reply to a topic, you can choose to automatically add that thread to your list of subscribed threads, with the option to receive email notification of new replies to that thread. Subscription Mode:
After that, does it say "Do not subscribe"? If so, you need to change it to one of the other options (I prefer No email notification).
Otherwise, there's a link in your profile under the "Statistics" tab that says "Find more posts by DizFan13" and that will list all of your posts, or at least those within a certain timeframe. You can also find that same link by just clicking on your name in any post. It's in the little list of links that pops up.
Hope that helps!