The market is up only 3% so far this year, although that's a big climb from the depths of its earlier declines. Investors as a group may be feeling pessimistic, but that doesn't mean you have to be. As Warren Buffett once said, "When investing, pessimism is your friend, euphoria the enemy." A gloomy market means lower prices, and that's exactly the time to buy.If you're looking for some investing inspiration today, my five favorite stocks to buy right now are Realty Income (O -0.60%), MercadoLibre (MELI 0.0 ...