7 Months

Today my son is 7 months old. The time has flown by but at the same time, the nights drag. He's a little monster crawling and pulling himself up on everything. He's also become very whiny and clingy, is that normal? He's with me 24/7 so I figure that's normal considering the circumstances but I'm hoping he outgrows it very soon! I have a hard time getting used to the new Graig. He's mobile, stays up longer hours, whines, throws tantrums, etc. He was the happiest baby always laughing and smiling. Now it's like a short window of the day he'll be like that. Well for me that is, he's a flirt with all the ladies. He's also really uneasy about new people. Some of the people aren't even "new". He stares at his grandparents like they have 10 heads. He's very different. I'm a first time mom though and from talking to friends who have babies around the same age they're all going through it now. For people who have kids, when did your child grow out of this stage? How long does it last? And how much worse are the terrible twos?