If you're genuinely an introvert, the alternative is you "hide at home" and have fun doing so. And socialize infrequently with few very close friends (basically, quality over quantity).
I'm pretty good at socializing when I need to. I'll still most likely be wishing throughout that I was out eating dinner or having a beer at a brewery by myself with a good book or HN on my eInk tablet. Being by myself is extremely restorative and makes me happy.
I think this is what having an introverted personality is like.
The difference is between gaining a skill vs loving what you do. Introverted person practice socializing is more of a skill development than actually loving every moment of it. True introverts are happy being alone (they are not lonely as in a negative sense).
I think it is easier for introvertes to gain extrovertion skill (clear benefits) than extroverts to gain introversion skills (benefits of being alone is not that obvious)