Not sure if they've got a Tropical Smoothie in your area, but I ask for a pinch of vitamins D, G, A, and F in my Acai Berry Boost and it's worked wonders for my Skatepark anxiety.
Seriously though, I don't like crowded parks either, but here on SLAP a couple few months ago this came up. The advice seemed to be along the lines of, "don't be a bitch". I'm definitely not, and not saying you are one, but whenever I pull up to a crowded park now, it rings through my head and then it becomes a matter of putting one foot in front of the other. I'll usually do a roll through past the blobs of gatherers to get a sense of the overall vibe and have found that generally nobody bats an eyelash and the pool warms right up. I guess what I'm saying is, DON'T overthink it and talk yourself out of skating. Nobody really gives a shit and is probably as self conscious as you. At least that's the way I like to think about it. On your eventual deathbed, you'll regret NOT skating more, alot more than you'll regret skating and/ or puting yourself up as a spectacle. Gotta be able to laugh at yourself, for he who laughs, lasts.