Hello Ghost19.
Welcome to the forum
I'm a bit confused.
You asked a girl out, she accepted, you kissed and cuddled ~ and then you asked her to be more than just friends and she said that she'd have to let you know about that.
I'm over 50, but back in my day, if a boy asked a girl out, and she accepted, then, unless it was stipulated that they were just going somewhere as friends, they were dating; boyfriend & girlfriend. If they were just friends, then there was no hand-holding and kissing.
So I don't think you took a risk by asking her to be your girlfriend, rather than a friend; I think that you were reacting to the way that things were going: ~ she was on a date with you, she was kissing you ~ or allowing you to kiss her.
Maybe things did move a bit fast ~ in that you had only just met, when you went out ~ and kissed & cuddled; so maybe she thought that it would be wise to slow things down a bit, and think about the situation before making any further decisions about this new relationship.
So, maybe you both moved too fast, but that does not mean that you were 'stupid', or that you made 'a huge mistake', when you asked her to be your girlfriend (I assume that this is what you mean). If you were 'stupid' and made 'a mistake', then she did, too.
Whether she will want to go out with you again, or, alternatively, regret moving too fast, before, I don't know. She may mean that she wants to see you again, or she may not.
Maybe you could just suggest starting again. Say that you think things moved too fast for a first date, and would she like to go somewhere as just friends, so that you can get to know each other better, before deciding whether further dating was a likelihood.
Then just wait and see if / how she responds
Good luck!