Is it normal to feel unsure about starting a new relationship?

I’m 23 and have never dated before. My guy friend of year has shown interest and so have I. I have liked him for a long time but now I’m feeling hesitant of starting things. Idk if it’s because it’s the first time I’ve ever experienced mutual interest or because it’s so new for me. Could it also just be a sign not to date him. No big red flags though.