You can pretty much boil it down to Liberalism is capitalist, leftism isn’t (although where the line is depends who you ask and how left they are).
The confusion mostly comes from from conservative neoliberals lumping social liberals in with the left, even though they’re only separated by a philosophical debate on what “individual freedoms” are and if they’re more important than a completely unregulated economy or not.
As someone who struggles with it, you have absolutely no idea what the hell you’re talking about. Even if I had all the support in the world my life would still be struggle day in and day out, because it’s so much deeper than just being different. I understand why people try and make it seem that way, but it seriously minimizes what it actually is.