Started my first business in my early 20's, only one girl for me, dont become an insecure loser that needs to prove themselves to other losers, finding someone willing to have your back no matter what unconditionally is not something to take for granted.
don't try to impress women with money unless you're looking to get taken for a ride.
Invest in property or business, personally I'd open a gym if i had 70k saved up.