Jihad is not something you need to decide whether you want to join or not. It is not like..."hey there is a large group of People going to war...maybe we should join them".
If it is time for Jihad you will feel it from the inside....If for example Mecca is nuked, every single Muslim, male, female, old and yound, the sick and the cripple, everyone will stand up, grab the nearest object to fight with and go on the streets. nothing is important anymore. Only one thing will count then: fighting for your religion.
Jihad is something totally different then what the ISIS idiots are doing. the only thing those terrorists are doing is giving Islam a bad name...they are an embarrassment.
Then there is another form of Jihad: the internal fight against evil. Every single person has an evergoing jihad against evil. not to do or say bad things...not to isten to shaytaan, etc. this is also called Jihad.