I'm going to throw a different perspective into the mix from someone who is gay.
It is a big deal, especially for teens, and I've never seen it discussed.
Common thoughts of people are along the lines of;
- it doesn't matter in this day and age
- mentions of homophobia
Picture yourself as a 15 year old gay lad or lesbian.
Your friends know and aren't at all homophobic, they fully accept you and aren't bothered at all.
In fact no one you come across is homophobic!!
You are different - different to most of your mates.
Let's say you are a gay lad and are hanging out with your mates and they start discussing girls they fancy. You aren't really part of that conversation.
You aren't going to discuss the hot lad you fancy (who is probably straight) - you just aren't!
You may be the only gay person in your year at school.
It's often only when that gay teen starts going on the gay scene when they are older that they feel they 'belong' more - find their tribe if you will.
(I'm not sure if I've expressed the above all that well BTW).
I've seen massive changes over the years BTW - I came out in the 80s.
Most adults couldn't give a damn about a person's sexuality, and neither do kids and teens.
I see far more gay people in senior positions in business and they are the ones my gaydar detects.
What I'm basically trying to say is that it isn't just homophobia that is an issue to teens coming out, in fact that may not be an issue at all but it can still be difficult for other reasons.