I am an introvert. Honestly life as an introvert quite difficult. 'Friends' are some species from a distant planet for an introvert and engaging in a conversation turns out to be the worst nightmare. Introverts enjoy spending time with themselves, to be left alone.
Introverts are usually sweet and warm by nature. Though it is difficult at times to get into their 'zone' but one you are close enough you might understand their true feelings.