a mamin – it is very lonely and there is no replacement for a parent. this feeling will never go away completely.
just try to remember that the reason u miss them is because they were so loving and how lucky you are to have had such loved feelings.
Channel your emotions to try and be what they were-love and guide your children or others.
Channel the longing for your parents to be longing and aching to return to yerushalayim and the shechina.
Maybe this can help you.
many people have had challenging relationships with parents, so you have to remember how lucky you are to have had this.