How do you come out as bisexual to your family who is catholic...? I came out to my two best friends today but I'm not comfortable with my family knowning yet...

Coming out is something you should only do if and when you are ready, and when you believe the freedom of openly being yourself will surpass the uneasiness of telling them. You can take all the time you want, and you're not even obliged to come out if you don't think it's safe. However, in case you decide to come out, prepare yourself to be very patient and express your feelings clearly and openly, make sure they reflect on the fact that love is a wonderful gift and the substance of it doesn't change whatever form it takes. You can also encourage them to ask you questions about things they don't understand and discuss it together.

Make sure you are comfortable with yourself first, and come out when you truly feel like It would be best for you. I believe that before you do so, however, that you should do some research. Make sure you are prepared to answer any questions they have, and maybe practice and share your concerns with your friends if you are still scared. Contacting your local LGBT center in your town isn't that bad of an idea either, and they can also offer a safe space if the worst happens. Hopefully that won't, however, but if it does then just get out and go to the safest place you know.