From the brief you have provided, it seems that you are low on your self-esteem (self-worth). You are just 19 years of age, I suggest building your self-worth by channelizing your energy into good career prospects, academic upgradation should help. Also, it you get stability, expressing your pain to a counselor and seeking scientific perspectives as to how to go about when selection an apt companion in life who is compatible in the long-run, too should be done. A counselor would also guide you on upscaling your current attitude and thinking patterns so that you wont repeat the same mistakes if any. Best wishes. Stay Positive!

As per your statement breaking of relationship will be hard to digest but life has to go on as you're 19yrs u have lots of things to do this is one of your lesson to learn how to overcome situation .U need to share your feelings to someone whom u trust for your betterment .stay mentally strong which will help you to get rid of your problem