I Need Advice On Relationships

Ok so I'm finally with the girl I've been talking to for a while! We click so well and everything is awesome, but I'm beginning to feel dependent on her affection and attention. Like I don't feel right when I'm not with her. I fear that I am becoming too needy or clingy. Also, how do I keep the relationship interesting so she doesn't feel like I started dating her and now I'm not going to put effort into the relationship? Any and all advice is welcome. :)