Should you feel yourself not being compassionate enough, then train yourself, starting at home, for instance. Usually, when you have some good food, you eat it first without considering other people. Starting from today, first ask other people whether they want it. Or, previously, you often gave priority to doing things that you liked. Starting from now, first ask other people what they like, and then do it for them; give consideration to yourself after everyone else. That's it - it's very simple!