I feel like a failure, sexually at least.

Currently pregnant 35 weeks, im legit never in the mood for sex, im stressed, my knees and legs are constantly killing me, i can barely hold my own weight, i just want to cuddle and enjoy time together. My husband always wants to be intimate, his sex drive is way higher than mine to begin with. And tonight just like usual ive failed. Hes not expecting sex because he understands my situation but wants small things like hand jobs or even blow jobs which honestly isnt a hassle to me but from the moment we got together two years ago ive always been awkward during intimacy and yeah i know they say voice it and explain your feelings and find ways to feel more comfortable but I've just never been a dirty talking/spontaneous or even sexual being girl, i cant even be normal. Im awkward and I cant help it and he isnt looking for anything big, hes not even looking for dirty talk or anything. Just a simple thing. Ive done it before but i always feel awkward about it not like super excited or anything. Not because im uninterested in doing it, i just feel incredibly awkward. Ive always been comfortable during sex but the extra stuff i feel awkward as hell. Hes also complained about me never initiating sex. In two years ive only done it maybe 4-5 times. Once again because im awkward. Im completely comfortable with him and we have a great relationship and can talk about about all sorts of personal things. But i have this awkwardness that doesnt go away so when i think ive got the courage to do it, then i have no balls and cant do it even though i want to, like what expression am i even suppose to have??? I just feel like ill look really dumb, cuz i won't know what expressions im suppose to have, how im suppose to act because i dont want him thinking i don't want to touch him which he thinks and he has started to feel insecure and its not even true hes got a great body and he looks amazeballs way better looking than myself. But i just feel like ill look stupid and that he'll interpret it wrong. I feel like im broken or something because it doesnt come naturally to me. I dont even know how to explain that clearly to him without crying because i dislike myself for not being able to do normal people things ugh idk. Ive just become depressed over it