Issues with cumming

So my Boyfriend loves giving me oral and fingering me probably more than when I give him oral or jerk him off. The thing is I’m really not a fan of cumming. The whole time he’ll be fingering me it will just be so much to take. Almost like it feels so good but because I’m not Cummings soon enough it hurts. So sometimes I’ll stop him because it’s too much and if I do cum then I feel overwhelmingly vulnerable and it makes me uncomfortable. And there’s nothing that he doesn’t wrong, he will usually lay with me and kiss me but I just don’t like the feeling. Does anyone else feel this way or have advice?