I can relate. I went through something similar with my now husband when I was about your age, probably a bit older. Honestly, I can't remember what I did about it... Sorry, that's not much help.

What do you mean that everything is "just too normal"? What do you feel/think it should be like? Does it feel like you're growing up too fast?

You mention that he's a "working man." What does that mean? Is he a bit older? Do you feel like he's pressuring you to settle down now? Is he supportive of your goals? You're young and you guys haven't even been together two years. There's no need to rush or starting planning your wedding now. You should be focusing on yourself, on doing what makes you happy, figuring out who you are. You don't have to be single to do this; you just need to make more of an effort for "me" time. Therapy can be helpful for this. You're right, marriage isn't right for you right now. But that doesn't mean it won't be right later on and with this same guy. Slow down, focus on yourself (not on the "what if"s), and enjoy the moment.

Once you figure out who you are*, everything else will sort of fall into place. Whether or not that's with him, no one can say for sure, but there's no reason to worry about it now.

*The phrase "figure out who you are" is so unhelpful. But I don't know how else to put it. It's also very anxiety-inducing in its own right. But you have to figure out what you're passionate about, what you want out of life, how you're going to make it happen, and then start at the beginning without worrying whats going to happen 10 years from now, 5 years, next week. Create a mission statement for yourself. Then whenever you do something, ask yourself "Is this going in the direction of my mission statement?" and don't worry about all the what if's. Much easier said than done, I know.

PS, my husband was my only "real" relationship and we dated for 7 years before we got married. I never doubt that he's the love of my life and being with him was, and continues to be, the best decision of my life.