Too soon?

I’m a senior in high school and my boyfriend graduated last year. We were friends in high school and started getting close over the summer. We became official in September. I’ve thought about maybe getting an apartment with him when I graduate. I want to! But is it too soon? We have only been dating for a couple months. By the time I graduate high school it would be 9 months. I’m nervous to bring the idea up to him... should I slow things down?