The first and foremost thing to keep in mind while revealing that you are part of the LGBTQ community is that your parents might not welcome it happily. They will still be hesitant to come out of their societal barrier so when you explain things to them,
Choose a place where there are no distractions
Give them educative facts
Assure them that it is a new phase in your life
Confide them your feelings and thoughts
Empathize with your parents' feelings
Whatever be the outset, find positives in them
Draw a line at who your parents can or cannot tell the news to