SAHM guilt catching up to me

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I started staying home full time when my son was 13 months old. I did this because he was getting so sick all the time from daycare. It's been 8 months now and I'm not sure I made the right choice. He is 21 months and only says a handful of words, do I not read/rhyme/sing enough? He is a sweet boy. Never pushes or grabs, but is he socializing enough? I guess I'm also feeling a little isolated (for my son and myself)... I can't seem to make friends. I've been tearful and tired for a couple days now. I could be slightly depressed, but I'm more just worried whether I made the right choice or not.