Being a cancer male... how do you get over your cancerian disadvantages???

Cancer female here, but I assume the disadvantages are similar regardless of gender. If you are referring to the qualities of being generally moody and introverted there are some things you can't change and have to learn to accept so make the best of it. For every con there is a pro. Here are some big ones
Passionate: Good solitary outlets are physical activity and creativity such as art, music and making useful things.
Persistence: The strong silent type are hard working, ethical and internally motivated so make excellent employees, colleagues and providers.
Protective: You will protect your pride first but once you consider someone a friend it will probably be forever and they will be lucky to have you. Adding empathy, respect and nurturing also makes an awesome spouse and parent.
Also remember that..
Time alone or at home are important for your wellbeing so make it priority.
The few things you do say out loud are worth hearing.
You have great intuition, never disregard your gut feelings.
The world needs people like us
Crab on :)