Any Excuse Will Do
Just as you set goals for yourself with regard to networking contacts, job leads answered, or telephone calls made, set a goal for the making of new friends. After you have found some folks who provide you with an initial sense of success, build on those friendships. (Alas, you may have to go first several times, even with the same friend.)
The only time “any excuse will do” is unacceptable is when it comes to giving up.