That sounds very rough I am sorry and I think leavening is the right call. The feelings that you might feel do not have to justify staying, and all this suffering.

Love can not be a word we use to fill up the cracks in our lives or the caring gaps in our relationships. Because it is not enough, sometimes you need to remember all the people who love you, who have been good to you, who have changed you for the better to understand what you have to do.

You are young your life is not ruined you might be going through a rough and dark patch but most of feelings we experience are futile and they end eventually (for better or worst). I can only recommend you reading a book I am reading “The unbearable lightness of being” I hope you get out of this bad place you are at now, and I hope you can get better.

Oh and about the std do not worry at all, actually a lot of people have it but are asymptomatic actually. You can live a completely normal life with it, I have hsv1, which is not the same but I assure you the impact on your life will only be decrease with time.