Wow, there are a lot of ways to keep up with things. I will explain how I do it:
Go to the top left part of the site and click on "User Settings". Scroll down and on the left hand side there is a tab for "Edit Options." Under the section titled Default Thread Subscription Mode you can choose to subscribe to the threads you post in or start automatically. There is even a setting for having an email sent to your email account every time someone replies.
If you don't choose to receive emails, but do choose to subscribe to every thread you start and post in, then when you log in you can click on "User Settings" again and it will list each thread you subscribed to with new posts. That's what I do and it's how I keep track of the posts I've made without having to remember.
If there is a thread you want to read but you don't want to post in it, you can still subscribe by clicking on "Thread Tools" on the right hand side at the top of the thread. One of the options is "subscribe to this thread."
Hope that is not too confusing!