I feel like this is a stupid question but I've tried to research online as well as throughout this thread what exactly boundaries are and how to set them but I just feel like I still don't fully understand. 

I never thought much about whether or not I set boundaries in all relationships, but I've slowly been recognizing that maybe I haven't been and I let a lot of people walk all over me as a result.

I usually put others first, and tend to own other peoples' emotions and feelings when I feel like any negative emotion or feeling was because of me and I feel like I need to fix it immediately, which is usually me subtly begging for forgiveness, even if I have nothing to be sorry about. 

I guess what I'm asking is if anyone could give me realistic **examples** of boundaries they've set with family members, friends, acquaintances, colleagues ... 

Another related question that maybe acts as an example for me to work off of?:   
I had one instance where I tried to set a boundary (I think) where someone kept pushing me to do something I made clear that I didn't want to do anymore, and because they kept pushing I ended up yelling at them (in public) which obviously caused them to feel embarrassed but I \*think\* that I am not in the wrong for this because I said no multiple times and they chose to keep pushing which would be crossing a boundary, right?