Am I too heavy

So my husband and I love to foreplay before intimacy and mine and his favorite thing to do is 69 but we have to do it like sideways because I’m too embarrassed to get on top I feel like I’ll suffocate him. We’ve been together 4 years and I’m comfortable with him but still a tad bit shy like I can’t sit on his face, it would be attempted murder lol jk. I’m not that big I weigh 159 and my butt is pretty thick idk if that matters. But how do I get over the fear to just ride his face, because that’s what he wants and I want to too but I’m kinda shy of how heavy I would be for his face what if I break his nose!? (He’s a big guy 5’11 weighing 205)