If you don't like your husband, Islam does not force you to live with him. Try talking to your husband and see if he divorces you amicably. If he does not, then if you are in an Islamic country, you can go to court and get khula (annulment of marriage) from court after which you will be free. If you are in a non-Muslim country, take an advice from your local imam and you may have to go through legal system to get a divorce.
As for your adultery, ask forgiveness from Allah (SWT) with an intention of never doing it again and never ever reveal it to anybody because nothing good will ever come out of it. Try to make up for it by doing a lot of good deeds. Allah (SWT) is the most merciful and He will forgive you for your sincere effort. See Qur'an 39:53 and Qur'an 3:135.
My advice to you sister is just be patient, follow through your divorce and remarriage through proper channel following Allah's guidelines and do not fall into sin again.