Please Hellllp 💔

Without going into too much detail, I just need some advice on what to do with my husband. First of all, I am the kind of person who loves and needs physical intimacy to feel close to my husband & feel confident in myself. Lately, our sex life has been subpar and just downright unsatisfying. 
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Basically my husband finishes QUICKLY. I don't time it but it's got to be 5 minutes or under. That's from start to finish. USUALLY my husband is really generous in bed, but I don't know what his deal is. If he's just lazy or if he's disgusted by me (probably not but that's where my mind jumps) or if he's just not as interested in sex as I am. 
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He has the lower sex drive. He hasn't always been like this but that's just where we're at right now. I'm not the kind of girl who complains either. I am usually the one who encourages and doesn't want to rock the boat. So I open up about how I need something more from him physically. We started spending 30 minutes every day just laying together and that really helped. But we haven't done that in probably a month. Then he started just "doing me" which means that I am the focus of the energy and he does his thing until I O. But I'm SUPER shy when it comes to that so I rarely ever ask. I would much rather have real sex. Then after I told him that I still needed more after we had sex, he would "do me" until I O. 
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Like I said, he's generally pretty generous but he hasn't been lately. And it just breaks my heart. I want my husband. I want to be wanted. But he's just not there? Idk. I just need advice on how to talk to him about this. The last thing I want to do is be a bitch and say "Hey, you're not measuring up. Step up your game!" So how do I say this in a respectful way?? I just want to know WHY does he finish so early? I want sex that lasts for like 10+ minutes. Why does he just seem not interested? 
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Also I feel like I should point out that I know that sex isn't just about me. I think I'm just the kind of person who likes to make others happy that I go a long time without being happy & that makes things worse. So I know he's not the only one in the wrong.Â