Fighting games are an interesting genre. Easy to hop in to for a couple of matches, but really hard to master. From my own experience it´s one of the greatest feelings to find THE character that fits you. Maybe they look cool, maybe their playstyle fits you, or... maybe the character just feels right from the start. After you feel a character, then the learning part is easier to get into!
But the learning part... oh man

I usually try to learn some of the most used/useful moves on a character first. What are the fastest moves to interrupt attack? What moves are good for counter hits that stagger the opponent? Which moves are safe on block? What moves are launchers?
So yeah, there´s many steps to learning a character, or mechanics of the game as a whole. It takes time and dedication, but at the same time you should not get too pressured by it or be so tough on yourself. If you have a mental block on learning, then you can be 100% certain that learning is not going to happen.
I think if you know even a handful of moves, it´s a good start, and if you can get even a couple of hits in a combo, it´s better than 0! You just can´t always land the "optimal combo", sometimes you whiff, sometimes you drop the combo, and that´s fine. It´s better to have consistent source of smaller damage, than always going for the most damaging option, but that is harder to hit.
I have no idea if these are helpful or just cause more stress
I ain´t a expert myself, but I do enjoy fighting games a lot. Of course everyone gets frustrated at some point, but the more forgiving you are to yourself and if you take losses as learning opportunities, you´re good to go! If you have friends to play with, I recommend that as well!