This isn't really an either or scenario.
You could not do your next year and also not get married.
The extra year of running is up to you. You didn't give your opinion at all about the running so it's hard to give advice.
You're too focused on the marriage just by this fact alone.
You should wait to get married. 5 years minimum. Marriage is not what you think it is. You haven't lived regular life with her yet. Getting married now is really bad decision.
Extra debt and one less year of earning and investing is definitely significant. If you really enjoy being on the team and college experience that still could be a fine decision though.