An easy way to calm and comfort yourself when you're feeling badly is through soothing touch. It seems a bit silly at first, but your body doesn't know that. It just responds to the physical gesture of warmth and care, just as a baby responds to being held in its mother's arms ... If you notice that you're feeling tense, upset, or self-critical, try putting your hand on your heart, or tenderly stroking your arm or face, or gently rocking your body.
What's important is that you make a clear gesture that conveys feelings of love, care, and tenderness. If other people are around, you can often fold your arms in a non-obvious way, gently squeezing yourself in a comforting manner. Notice how your body feels after receiving the hug or caress. Does it feel warmer, softer, calmer? - Kristin Neff
Read more here