This is easier when you don't have a significant other :)
Just make sure you pick a significant other with similar priorities to yourself (which also is never bad advice).
There's definitely a social pressure that once you get a real job you should have grown out of eating ramen and taking public transport.
And if you put a kid on the mix, it is event worse.
Don't date people that don't have prudent attitudes toward personal finances. God forbid you end up sharing a bank account one day...
My girl is extremely frugal compared to most of her friends, but we still argue about money a lot.