Coming out advice

So it's been a while since I've realized I'm not straight. Two of my friends already know it but I want to come out to my mom. Me and my mom are really close. We talk about literally everything and she loves me a lot but the thing is we are a catholic household and she doesn't understand lgbt(although she never talked bad about them but she said she wouldn't want her close people to ne gay) I tried bringing this up but always got scared.
She is currently telling me to get a bf and I just want to tell her the truth. What do I do?