I'm dating a really busy guy, where should I fit into his list of priorities?

I've been dating my boyfriend for 3 months now and from the minute I met him I had this feeling he was "the one". He has so many great qualities including being really hard working, responsible, great leadership qualities etc. and everyone seems to like him.

The problem is that he is really, really legitimately busy all the time and while I was OK with his busyness initially, I'm not sure how to deal with it anymore. He works most weekends as a paramedic (12 hour shifts) and is also in school full time. Any weekends he's not working he is getting caught up on assignments.

I work a normal 9-5, Monday to Friday job ..so I often find myself sitting at home during the evening or on weekends, waiting for him to text or call to see if he can fit me into his schedule. I will often purposely try not to make plans with other people just in case he's able to find some time to hang out with me which makes me feel so pathetic when he doesn't call. I feel really hurt by it..and then comes guilt because I feel like I'm being selfish, wanting to hang out with him when he is so busy.

I should also mention that we never make plans in advance just in case he has to do schoolwork or gets called in for an extra shift at work. I think the furthest we've ever planned anything in advance was the day before..usually he texts me about an hour before he can hang out. It makes me feel like I'm not much of a priority..plus I feel like maybe I'm being "too available". =(

When we're together he talks about spending the rest of his life with me. He's already talked about marrying me, having kids and a future together. I don't think he's leading me on because he also talks about these things in front of other people, including his own parents.

I totally understand that school needs to be his priority right now and that he needs to work to pay for school..but is it wrong for me to want to be somewhat of a priority as well? Is it OK for me to speak up to him and tell him that he needs to set some time apart for "us" or does that make me sound too needy? I know guys get really focused on goals but does that make them forget their girlfriend has feelings too? He's under a lot of stress right now as you can imagine and I don't want to add to it. I'm trying to be as understanding as possible but it's killing me inside. Help!
I'm dating a really busy guy, where should I fit into his list of priorities?
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