My life growing up would have been much easier if I had known where my friends and family stood.
Back when I was only about 18-19, dating my first boyfriend, we were both still too shy to be out to all our family, and didn't go to each other's family functions. However, we did accompany my parents on a trip to Georgia to stay with and see my grandmother and some other family for a few days. As our trip came to a close, an older (like, 25 years older) cousin and I were saying our goodbyes, and she gave me a little card. In it, she had just written that it was nice to see me after such a long time, and that she hoped to see me again soon. She also wrote that she was happy I had found love, and wished me the best. That part will stick with me forever, because my boyfriend and I had made a point to not be too affectionate with each other, or so we thought, but she could obviously tell what was up. That was one of the nicest things anyone ever wrote to me, and I'll remember that forever.
I'm out and proud now, and thankfully my family and friends have never had any issues with it, but I know how important it can be to others, and I've had friends (who I had assumed were straight) confide in me, and it makes me really happy to help them talk through whatever they're going through.