No one wants to speak to a robot, so embrace your weirdness and allow yourself to make mistakes. Eventually, you'll just get better, but you have to allow yourself the opportunity to just say something rather than hold back and risk an "imperfect" conversation.
Being a bonafide introvert myself, I know that us introverts have somewhat of a unique perspective in our day to day actions. About 50% of Americans are introverts believe it or not and you can bet that most, if not all, need their recharge time after "people" engagement. I've met many introverts ranging from the ones you thought all along were extroverts and ones who just hate being around people altogether and never in their lives would be caught dead at a party over 2 people.