DTR's a Bitch

I met this guy on the first night of college and I swear it was love at first sight. Our dorm was having a hall meeting and when we walked out of rooms we locked eyes and I knew. We became quick friends and a couple of weeks later we realized how crazy we were about each other. He's such a wonderful guy and he treats me so well, but we've been a thing for about 3 months now and we haven't defined it. All of his friends know about me, but he refers to me as his friend and his sisters know he's with someone, but they don't even know my name. Sometimes he mentions the future so I know he sees me in his, but I'm just afraid I'm getting too attached. I'm really falling for him. Is it too early to define? Should I worry that he hasn't or is this normal for guys?