Help me ! How to avoid ?

This is like I need to avoid having sexual with my husband as he never satisfied me much in 6 years of married life..

Sorry for the long post !

We have been married for six year and have a 6yr old son. This is like he never have complimented me and my body ever and never ! I have tried to my level and reduced like anything that am able to wear my school dress even ! Am happy about it a lot.. but he never felt that.. sex is his all time thing but he never had well with me and always will be a machine when it comes to him..

Like he f* and moves on even not caring to remove my underwear! Just slips in and does and goes off once he blows out over me! Haven’t cared to caress me and make me drive for him and to be frank he never kisses me ! A normal lip kiss I mean ! I can count the number of kids he gave in 6yrs.. I feel very bad ! Hugging he never does as he doesn’t get any effect in that what’s that he says me !

Due to this unsatisfied love am getting much depressed and stressed ! Am not sure if it’s normal to be like this since am not happy with sex or am thinking too much ... I decided to avoid this to at most politeness since I don’t wanna enter into fight and get hurt mentally to core. Of course I can’t leave him since my son says he needs him and he loves him a lot ! I can live without this sex even for lives since I was like that for a long time even in this marriage days !

Please say me best way to say him he should not disturb me ever for this.. I have messaged him and tried to talk him in person and he haven’t cared for that too !

He had a ex gf whom he wished to marry and they broke up due to some other reasons and still they were in touch over phone calls even after our marriage ! I found that and we had a great fight and now am not sure if he is still in touch with her. This happened like 4yrs back... am hell done with that and even will accept if he wants to continue those crap with her ! I don’t wanna get stressed and affect my health and all ! Please help me !!