It is understandable to feel discouraged after all your hard work in school- looking forward to starting your future and life is just not cooperating. We are led to believe that once we graduate we can start our career immediately in our chosen field and our path will be straight and smooth. And for some people that happens- but for many more of us our career path can have slow starts, detours, dead ends and engine trouble. The important thing here is to keep trying. Give yourself credit for your attempts. You will find the door that will open. Keep putting yourself out there. I don’t know if volunteer work is something you could consider- you mentioned student loans- but if you keep trying you WILL find something. Even if it’s part time, temporary, not in your field, take it. I think you will start to get your confidence back once you are earning money and busy with work responsibilities, in addition to meeting new people. Be the best employee you can be. If the job is short term, ask your boss for a letter of reference to use in your job hunt. Keep your skills up. Sometimes we end up in places we never imagined we would be, but often the universe puts us there to learn something or to meet someone or to find something out. Detours are not a waste of time.
I am much older than you and while it might not seem like it to you now, life goes so fast. You have youth on your side, and you are just starting out. Is there something that you would like to try or have always wondered about? Now is the best time to consider that- it will be much harder later on when you may have more financial responsibilities and your career path will be more settled and then you may be reluctant to disrupt it. You need possibilities to get over this feeling of hopelessness. Things will get better – you are bright, articulate, educated. Believe in yourself and don’t give up.