to be more friendly

1. Smile when you see people you recognize. As you walk through the office, down the hallway, etc., you might notice that it's your natural reaction to look at something else or do something with your hands rather than acknowledge a new acquaintance. Try your best to look in their direction and give them a warm smile to let them know you care.
2. Learn to speak small talk. Avoid those awkward conversations by always being prepared with something to say during a silence. This doesn't mean to carry around a reference book, but try to remember things that might spark a conversation with various different people. It's particularly impressive if you remember something about a conversation you've had with them before. Follow up on anything you talked about.
3. Try to talk about positive topics. Nobody likes hearing how awful your life is; always talk about the better parts of even your worst days. It will not only lighten up a conversation, it will help you to truly think about the silver lining in life's little "situations".
4. Have some humor. Even if you don't think a joke is funny, try to laugh! You'll notice you actually laugh more naturally, and it cheers you up. Don't be the sore sport of the bunch; enjoy yourself!
5. Break your worst habits. You might not realize it, but they are affecting your relationships. You will be less honest with people if you're hiding awful habits that you are ashamed of. It will feel like a weight is lifted from your shoulders, as cheesy as it sounds.