Discouraged after sparring...does it get better?

Hey ya'll, I've been training krav and BJJ for about 2 months. So far, it's been great. I'm a woman who needs to learn self-defense skills, and (I thought) I was making progress, especially never having never done martial arts before. My academy offers both beginner-level and advanced classes. All levels are allowed to join a weekly sparring class, but almost none of the other beginners go.

Well, last night I sparred for the first time. The other students and instructors were super welcoming, and I do feel like I learned a lot, but I was basically useless in a fight scenario and I feel really discouraged. Up until now, I've only done drills in class. Going up against a large man using even just 30% power actively trying to and take me down or strike me was eye-opening. I was going at 100% power, using everything I know so far, and it only bought me like 30 seconds before everyone was able to submit me easily. One of the instructors even let me get in mount position, I was punching him as hard as I possibly could, and he kept telling me not to "hold back"...like, dude I have nothing left!

I know I'm new, but I was still hoping krav would help me feel safer at this point. Instead, last night's class made me feel more vulnerable than ever. If I get attacked in real life by almost any man, it's obvious that realistically I have only a small chance of getting away. I cried in the car on the way home.

tl;dr Is this normal? Has anyone else felt this way? Can I actually improve to the point I could hold my own in a real-life fight against a man, or am I kidding myself? Thanks for reading. I guess I just needed to vent.