Ending a relationship

Hi.. looking for advice and if anyone has dealt with similar situation. Before u jump on me, i do feel guilty about this but.i have no one i can talk to about this to. My husband is my best friend but i no longer have that sexual desire or interest in him beyond friendship. I more get annoyed at him always asking for sex, so he wither gets angry because he feels rejected or i just go.along with it and get annoyed. The thought of ending things scares the shit out of me as we have a 3 year old together and financially we both couldnt survive on our own. I feel so lame even writing and reading this back. Im confused . I either think the grass is greener or im genuinely wasting both our time.