<human>: Give me the gist of the text in a nutshell

I've always had problems talking to my parents. The root of the reason is my mom says I can talk to her about anything. However, whenever I'd tell her something in the past she usually flips out. This could be with anything (Going on a trip, visiting a friends house, getting into a relationship.) And the reaction can be her just getting pissy to a full out screaming. 

With the smaller stuff I have no problem talking to her. However, I just got into a relationship and I'm absolutely terrified to say anything to either of my parents. They both hated my boyfriends I had in high school and this is actually my first boyfriend since then. They also made it hell to do anything with my ex's back then. I'm aware that I'm an adult now and they shouldn't be as overbearing. But i'm still worried. (I know i'm probably leaving out info. If i'm not clear on anything please ask! I'll do my best to clarify) I, unfortunately, have to live with them right now due to money reasons and don't want to hide this too long so I can keep the peace.

I need help telling them. I tried to last night and got so sick to my stomach I almost threw up. It's like I just can't get the words out. I was thinking about saying something to my mom on Facebook, but my best friend told me to man up.

So reddit, any advice on how to deal with this situation, and these situations in the future?
<bot>: I have issues talking to my parents about important things. (New boyfriend.) How can I get over this and how can I get myself to talk to them with out making myself sick?