Join a club or organization or volunteer somewhere. It has to be in person and you have to go even if at first you aren't comfortable.
All the friends people make at school are happy accidents of proximity and chance. Same with coworker friends. You have to make some luck for yourself, put yourself in situations where you will regularly see the same people and get to know them through what you are doing.
Also, don't focus on romance, focus on friendship. Romance will come naturally - not forced.
I know this does not come easy for most people in your situation. It feels stupid and awkward but chance and circumstances play a huge role in making friends.