Is it permissible to be in a relationship with a young man who drinks alcohol and does not pray, knowing that he does not wish to marry, and despite my regret, kissing has occurred between us?

There is no need to worry about not getting married, and suicide is not a solution. Marriage is a highly recommended act to reduce temptations. You must respect your mother and not mistreat her. The relationship with the young man is wrong and a satanic act. You must repent sincerely from it and cut off the relationship immediately, especially if he drinks alcohol and abandons prayer, because he is not worthy of marriage. The most important things when choosing a husband are his religiousness and character. You should not reject many suitors; rather, you should inquire about them and perform Istikhara (prayer for guidance) before accepting. Marrying a righteous man brings happiness and comfort. Finally, you should associate with righteous sisters.