Is my boyfriend just stringing me along?

I'm 21 and he's 22. We've been together for almost 2 years, and while I've mentioned him to my family multiple times, I'm not even sure any of his family knows I exist. Anytime I've brought it up to him, the few times I have although it really bothers me, he would make excuses like "I don't want them all in my business asking questions" or something. I feel like we're getting too old to be worried about that nonsense, but I haven't brought it up since. Also, he never really hints at a future with me. We go to the same school right now but he graduates at the end of this year, and lives 3 hours away during the summer and I'm not sure what will happen when he does. I'm worried, and I don't know how to bring up this conversation. What are your thoughts?
Is my boyfriend just stringing me along?
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