Here are a few important keys on how to become a more social person.
1. Have it in mind and be ready to act: What most of us are is a factor of what we have in mind. Always remind yourself and saying it to your senses that you want to be more sociable, and you are going to be.
2. Start small: Mind you, a real and original change does not come on a day. It has to be a gradual thing. So, do not force it on yourself. You need to master the process so that you won't get back into frustration.
3. Have a chat with strangers: Gradually try to have quite a long talk with people you do not know. Don't just stop at the place of "hi." There's always more to say. Chat with the person next to you on the bus, the driver, next person in the queue, etc. You can equip yourself by asking random people what the time is.
4. Always have something reasonable to say. This comes by acquiring more knowledge. When you acquire tangible knowledge, people will enjoy chatting with you, and you will love it also.