Lots of wonderful advice in the thread as is typical of Lemmygrad :) Let me add my 2 cents:
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When online, post memes with anti-capitalist, anti-fascist content. But you know, memes of the fun types. Then see who get the joke and who don't. Those who do are more or less predisposed to listen to further ML stuff. Those who immediately attack you for the memes are based fascists, they know what you're trying to do because that's what THEY have been doing for 10+ years. Humour is the "plausible deniability" which gives you some room to maneuver. Add wtf, it helps a lot in bringing down emotional barriers.
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Join an org and get to know like-minded people in person. You'll quickly forget you are the "odd one out". Feeding the homeless, trade unions, political party... anything goes. As soon as you see you're fighting the good fight, your confidence will multiply a thousandfold. When they mock you for feeding the hungry, the joke's on them. You'll remember the smile on the hungry person's face, you will know you stand on the right side of history. And that's just 1 example.