Where to live in Charleston as a 22m

I just got a job out of college down in Charleston located on Daniel Island. I’m have somewhat narrowed it down to downtown or mount pleasant. I want to be around people my age and have some things to do such as nightlife or activities. I also was hoping to be by a beach or water as I really enjoy fishing and being outside. In a perfect world my commute from Daniel island isn’t too far as I hear traffic gets really bad and don’t want to be in traffic for 45 minutes everyday. I was in a fraternity and am rather outgoing so I didn’t want to be somewhere with a bunch of middle age folks.