How to avoid stress? The first step is to determine which pressures of life have to be avoided and which have to be embraced. Rejecting all stress outright is usually an act of desperation by a person who is on the verge of mental breakdown.
To successfully avoid stress you have to start with a long, hard look at your priorities in life. There priorities have to be put into proper perspectives, and then you are in the situation to be able to decide which pressures to embrace and which to avoid.
What is the most important thing for you in life? Focus on that. Death will eventually de-stress all of us, so do what you can to lead a happy and fulfilled life. If the pressures of an activity or situation do not bring you a sense of fulfillment, feel no guilt while you do your best to avoid them.
Perhaps the simplest technique of avoiding stress is to learn to say 'no' to people. Saying "I don't want to" or "I don't feel like it" are perfectly good ways to decline invitations for stress - don't make excuses.
We carry a lot of baggage with us in life that fills us with unhealthy stress. Just cut these out, put them in the garbage bin, and regain the bounce in your step.