In situations like these, I usually say trust your gut. These doubts are not common (based on my own experiences and that of many friends who are quite open with me). You have already decided that something is not correct and it doesn't feel right. When you are with him, the glamour filter is on and everything seems great, but later, when you have time to yourself and time to reflect, that bad feeling is still there. That is the real feeling.

If you stay together longer, that feeling will grow, and the glamour filter will stop being effective. I'd recommend not prolonging the inevitable, however that's truly up to you. Two months is quite short as far as relationships are concerned and you are still learning things about each other. It seems like the more you've learned, the more this feeling has happened. You can always talk to him about your fear of things moving too fast. See if he's willing to work with you, and maybe that will ease the feeling? It could be worth a shot, but keep an eye on things. That doubt is a good first warning, so feel free to try and get around it if you really want to, but if nothing changes then it might be time to part ways.