How do I make my man open up to me? He's not the talkative type.

Me and my boyfriend have been together for a year and a half, but he rarely talks about his life and personal problems. When I want to know something I end up feeling like I'm interrogating him. His mom tells me she has the same problem. But I wish I could know more about him. I've talked to him about it. Although I haven't tell him that it bothers me. I'm a talkative person so I feel he knows me more (way more) than I know him. So you guys understand. I barely found out last month that his favorite color is red.

What do I do!?-Thanks for your answers
How do I make my man open up to me? He's not the talkative type.
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