Grace gave you good advice. Before you tackle dealing with family and friends, spend some time dressing in your gender and interacting in a safe environment, like a support group. Don't force yourself to be overly feminine. Just act natural. You will likely rediscover a lot of natural feminine mannerisms that you buried in childhood -- at least that was my experience.
And as far as being a tough masculine guy -- don't worry. Hormone therapy will fix that.
My other bit of advice is, take some time to discover your personal style. You are a girl, so act like one. Figure out your favorite colors, and your favorite clothing, and how you want to express yourself. T shirts and skinny jeans? Tunic and leggings? Dresses and skirts? Maybe try a wig or two to see how you like dealing with long hair. Experiment with breast forms if you want. Or if breast forms are not your thing (I didn't want them, I wanted it to be all me in the bra), then get some padded bras or smooth front sports bras or bralettes.
You would not enter a motorcycle race with no prior riding experience. So no need to walk into the lion's den without some advance preparation. This is about who you are. You've been suppressing your true self for your entire life, so you need some time to learn to express yourself. So go do it, have fun with it, and only deal with people when you are comfortable.