You should try talking to strangers (which can be intimidating, trust me, I know!) or people a little bit older than you. Maybe around town or if you visit a neighborhood outside of your comfort zone a lot then you should try socializing with people around there.
Get involved in activities that you enjoy, whether it be sports, or charity/volunteering, etc. You will meet people with similar interests. Get out and about in your neighborhood, go for walks, and it just happens. You bump into people and chat, and it grows from there.
Friend plays a very important role in our life time. A life without a friend is a life without a sun. correctly. Some people like making friends abroad and are willing to be friends with the majority of people. They classify their friends into different levels. They hold the view that one more friend, one more way. When they meet with challenges and difficulties, friends usually lend a helping hand to us and come up with effective solutions. Just as the saying goes: depend on parents at home and depend on friends outside. In addition, friends can figure out our weaknesses and strengths in front of us. So it is helpful to correct our shortcomings and improve our ability. Just because of this, we can benefit a lot from friends during the time of communicating with them.