Speaking in front of others, contrary to popular belief, isn't a skill but rather it's mostly just a matter of getting comfortable with your audience. If you want to get comfortable with it, try to talk in front of people that already know you first, the people who don't judge you immediately like your parents or friends. Then slowly replace said people with strangers and then you'll realize that talking to strangers is pretty much the same thing as talking to people you already know because most people aren't sociopaths :p
I mean seriously, it's something that you'll figure out naturally in time. But, practice usually is the perfect way to get comfortable with people. Please note that there's a difference between getting comfortable with people and having good people skills (the latter in which is a bit more technical).