How to solve sexual problems with my husband , specially that sometimes I feel that our sexual life doesn’t make difference to him cause he is always opening sexual sites through the internet and leaving me alone although I know that he loves me and am beautiful.

From your very short description what I guess is, he might be having voyeurism. It is one kind of sexual deviation in which person get sexual pleasure by viewing erotic pictures, movies etc. Sexual sites are full of such materials. All males like to see such pictures and movies to some extent. However, they do not avoid actual act. As he is avoiding actual act (even though you are beautiful and he loves you) he requires treatment, if he agrees.