When the activity feed was first launched, I assumed that people would care only about their own friend feed, and the user's personal feed would be useful probably for others visiting the profile. You could still access the personal feed, but to get to it, you'd have to click the feed tab, and then 'my feed'. The best way I can tell when I'm wrong is when I start hunting for the same hard to get feature that I thought no one would want. ;) After a zillion times trying to get to my own feed to remind myself which ep I watched or what manga I just read, or, which person I just left a comment for, I realized it's time to add the personal feed to the profile. So, you can now view your personal feed on your profile - it's listed right below the friend feed. Enjoy!