Don’t hate yourself! Regret is an important part of the tshuvah process an you are still a creature created in the image of God.
Here are some resources that might assist you: Rambam’s Hilchot Teshuvah contains a step by step process that might be of help. Both the original Hebrew and an English translation are online at chabad.org; it is part of the Mishneh Torah. So does Rabbi Yonah of Gerona’s sefer Shaarei Tshuvah. Good luck! And RaMChaL’s Mesillat Yesharim, based on a gemara in Avodah Zara, is in large part about elevating ourselves to higher levels of purity.
Good luck! This is a great topic for Elul.