Sex and Marriage

So Last semester being a freshman in college and growing up so sheltered wasn’t a good combo. I let a guy I didn’t even know that well take something I use to cherish so much! After that I had sex with three more guys because I stopped carrying about myself. It’s been four months since this all started. I still have my purity ring and every time I look at it I get so disgusted with myself. I just need some advice on what I do. I feel like I’ve let myself down so much.😓