I have found a fear of public speaking or socializing comes out of a concern for the topic. As a founder you are the expert in your business. Showcase that but keeping the discussion focused on your strengths. Also, if you are not the type of person who likes to work a room at conferences start with softer ways of outreach through social media where you can play a character or a role of a charismatic founder without having to do it face to face. This can lead to one on one emails or direct messages, then slowly phone calls, so you can ease into the discussion with a prospective client or partner.