I want to drop everything and move across the country

I've found myself in a tough situation. I'm currently dating a wonderful girl I met online. We've been a couple for close to three years, and have known each other for six. We talk nearly every day, have survived more than one major argument and even one temporary breakup. I can't see myself with anyone else besides her. The problem is she lives halfway across the country. Our original plan was to have one of us finish school first, but we're both so tired of waiting. I'm so incredibly lonely here. It's gotten to the point where I just don't care about school anymore. Part of me wants to just...pick up and move. I know it's incredibly irresponsible but I'm absolutely miserable here. One of my best friends lives down here, but half the time I end up at her house, I just get depressed because she has her boyfriend here with her. I'm 25 years old. I'm not just a lovestruck kid jumping at the first thing that's come along for me. I've had a few relationships, one that ended badly and my current girlfriend helped pull me out of the after-effects of. During our breakup, and even while we were dating for a while, both of us were looking for more local relationships, but no one else felt right. I want to spend the rest of my life with this girl. We've talked about jobs, kids, wedding plans, everything. I've never met her face to face, but I know i love her, she means everything to me. When she's happy, I'm happy. She can pull me out of ruts that I never thought I'd get out of. I'm just worried I'm going to rush off into something stupid. I just don't think I can wait anymore.