Having trouble using Facebook with privacy issues. Please help.?

[xbox786]

In my Facebook account, I was not able to see other people's activity log such as new friends, comments on pages, likes, etc. For this I assumed other people can't see my activity either.

Today, I just noticed my mom's Facebook, where there is a window on top right listing all the activities by other people. It shows who became my friends and when, what page and posts I liked, my comments on other people's posts, etc. I wasn't able to figure out why this same window does not show on my Facebook account. Now I am so scared that my mom and other people were seeing what I do on Facebook. How do I prevent this?

I always have problems controlling my privacy in Facebook. Today, I noticed that my last workplace disappeared for unknown reason. I added it back and noticed that it showed up on other people's FB that I added a new work. It was embarrassing because it was my old workplace like years ago.

I don't mind people seeing my stuff if they want by their own, but I am really embarrassed if things about me pops up on other people's FB making them aware that I just liked something, or someone just became my friend, etc. I searched through privacy option and didn't see any option to prevent it.

If anyone know any tactics of using FB wisely, or know of anything I should avoid doing because people know about it right away, please let me know. I will appreciate any help.

And just to let you know that deactivating FB account is not my option.