Stuttered badly during an interview. Feeling hopeless now.

Stuttered badly during an interview. Feeling hopeless now. I'm a 21 year old male and have stuttered for as long as I can remember. I gave an interview today. It wasn't my first time, and I went in with a lot of optimism as I had fared quite well on my earlier interviews. Today, I tried to act normal before going in and imagined myself answering to every question very calmly. However, the moment the first question came, I lost my composure and started stuttering hopelessly throughout. At the first indication, I declared that I was a stutterer and the interviewer was considerate enough to tell me it didn't matter that I stuttered. The reassurance didn't work much, and I could not regain my composure. I encountered blocks on every other word and in my effort to restore fluency, I started rambling. I think I've been rejected for the job as a result. I have an important academic presentation coming up in a week in college, and thanks to today's debacle, I feel shattered and defeated. I have pledged to never, ever give up on combating my stutter, but thoughts of my future as a stutterer- during presentations, interviews and conversations- always unsettle me. Have anyone else here experience anything like this? Can you offer me advice about rebuilding my shattered self-esteem? It's been a hard day. Just wanted to share this here. Thanks for hearing me out.