It sucks when you have to be practical in the face of emotion, but in the long term it'll lead to way less heartbreak. Why feel like you're being put into a mold that doesn't fit? Neither one of you is wrong for being the person you are, or having the experiences you have, but it does sound like you two were a poor fit.
(big hugs) Allowing yourself to grieve for this relationship and your marriage will probably make you feel a lot better. Be kind to yourself, maybe see a therapist if you want to vent to someone unbiased. The worst part is over, and now be sure you tend to yourself.