It's very difficult to find your own topics.

If you click on your own name, or your icon in the top right of the page, you'll be taken to your profile page where you can filter results by discussions or comments :)

http://puu.sh/dzBmU/1169f40a44.png

http://puu.sh/dzBnM/5834c25dd3.png

hope this helps!

I can only find mine once someone replies to it by searching through the long list of updates.

ikr

http://boards.na.leagueoflegends.com/en/player/NA/Flamingo%20Tango?content_type=discussion

2 clicks away,

1. Click your icon at the top right
2. Click "Their discussions" at the top middle

Interesting