Getting people to like you is easy. Some people doesn't even have to do anything but to be themselves, while others feel they're lacking social skills and need some help. Well, the first thing you need is a "SMILE". Yes, you've probably been told that smiling will help you get friends, still, i feel most people really underestimate it. But think about it for a second. Imagine approaching someone you want to befriend and they look up at you with a gloomy, closed-off look. You wouldn't want to hang out with them would you? A smile will make you seem open to conversation, and it will make you look like a positive person, which will attract more people to you. Practice smiling every day before you leave the house. And if you feel it's getting harder to smile, just tell yourself you're happy, awesome, or just tell yourself a funny joke. Thinking you are happy will actually make you happy.
This atleast is a start, so take my advice and never leave the house without a smile!