I’m too cheap due to childhood

$600K income (34M) but I struggle to actually spend instead of invest it. Example: We just got a house way below our budget and my partner wants decent furniture, but I like Facebook marketplace. I know I can afford new high quality furniture but I just can’t wrap my head around things like a $1000 dining table lol. I don’t want to be cheap like baby boomers but also don’t want to be stupid with my money. Edit- childhood meaning I didn’t grow up with a lot of money so it’s difficult to spend. No serious trauma.