I [27M] like this girl[27F] from my school. Should I text or should I wait

I've been waiting to send a message to this girl I know I'll get married to if things go well for a long time. But am scared I'll fuck it up if I talk now owing to my busy schedule. Should I wait few months more or should I not. We've never really talked outside of school ever, have known each other since day 1.