Relationship anxiety?

I've been getting closer to this guy and I don't know if anything is going to happen between us, but I am so nervous. When I think about us possibly dating I get so panicked because I start thinking

'we might date, and then the relationship might get more serious, and then we've been together for years, and then we'll hate each other and split up'

Which scares me beyond belief. I've been looking it up (I know this is ridiculous but anxiety) and I've figured that 30ish is the best age to get married and I'm 20 now so what is the point of dating someone and possibly getting serious when it'll probably end in divorce because we married too early on and didn't have enough relationship experience, but if DONT date how will I get that experience that I should have so I don't rush into marriage with the first person I like and fuck it up?

So basically, I want to date but I don't but I do. I'm scared of divorce but want to date but I don't want to deal with a relationship ending. 😫😫😫😫