After highschool, I actually isolated myself from the small group of friends that I had, except for one. At the time, it was okay. I would always find solace in the internet and the friends that I would make over there. When I came out, the one friend had moved back into town. I texted her with my feelings and all she said was "Okay." We met up that afternoon and I explained it more to her in detail. Since then, she's been great. After her, I gradually came out to everyone and then lastly, my work boss. All these worst case scenarios come up in your mind that you think might happen if you tell them. It's scary, but sometimes it works out really well.
Just like any relationship, and in the words of Jessie J, "Those who matter won't mind, those who mind won't matter".