Making friends is a skill. Like most skills, it improves with practice . If you want to make friends, you must be able to take some action . You must first go where there are people. You won't make friends staying home alone.
Join a club or a group, for talking with those who like the same things as you do is easier. or join someone in some activity.
Many people are nervous when talking to people. after all meeting strangers means facing the unknown. And it's human nature to feel a bit uncomfortable about the unknown.
Most of our fears about dealing with new people come from doubts about ourselves. We imagine other people are judging us, find us too tall or too short, too this or too that. but don't forget that they must be feeling the same way. Try to accept yourself
as you are, and try to put the other person at ease. In this way you'll feel more comfortable .
Try to be self-confident even if you don't feel that way when you enter a room full of strangers such as a big hall, walk straight in, look directly at other people and smile. If you see someone you'd like to say something to, don't wait for the other person to start a conversation.
Just meeting someone new doesn't mean that you will make friends with that person-friendship is base on mutual liking and "giving and taking". It takes takes and effort to develop. And there are things that keep a new friendship from growing.