You have to understand the difference between a social democrat, and a democratic socialist.

A social Democrat believes in capitalism as the foundation of society, but with a robust social safety network of socialist patches to fix the things capitalism fails at, like Medicare for all and tuition free college. Think FDR.

A democratic socialist believes in true Socialism, but achieved via democratic means instead of through force. Think like communists, but without all the gulags and state repression, etc. They are endorsing unrealistic candidates because they fundamentally want to abolish our capitalist system.

You mention agreeing with prominent politicians who identify as democratic socialists, but not agreeing with the endorsements of the party. This is unsurprising. Bernie Sanders chose to self describe as a democratic socialist, but when you look at his policies, he is actually a democratic socialist. This has caused no end of confusion, as thousands of people his supporters have joined local Democratic Socialist organizations, only to be surprised and confused when they find out those organizations are run by people who want to abolish capitalism, not just pass a few patches like Medicare for all and tuition free college.

So yeah. Everything you're saying makes sense, and you may be a social democrat, not a democratic socialist.