No sex, no affection.

From the beginning when I met my husband his been very shy and I'm guessing to self conscious so he would always go down during sex. Anyways it's picked up a bit since he went to docs and taking pills etc. Been married for 3 years now we don't cuddle ever , he he never touches my butt or breasts like his way too shy..., we don't have sex and if we do I mention something or he does very rarely and most of the time he doesn't stay erected. ..I know it's mentall for him and no matter how many times I've tried having conversation with him , besides him not staying erected but there's no affection between us, im used to it by now but still bothered, I love him but we're like 2 roommates with a Great relationship and no affection or sex ,I myself don't give him affection because it's akward since he never does nor tries .....we can go about 1-2 month not having sex ....anyone else ? Any advice ?I don't know what to do , it's like his a little boy and scared. ....3 month pregnant and this been going on since we met.