Everything is a gamble. Everything you do is a function of perceived risk, vs perceived reward. The things that go into the equation are your level of skill and ability can lower the risk. Getting in a car and driving is a gamble. But most people would consider the risk so low the reward for using a car far outweigh the risk.
You are trying to say that life is gambling or you are trying to say that taking a risk is gambling which is wrong. It is right that life is full of risks but it is also right that if a person will worry about these risks then he will not be able to survive in this world while if a person will have knowledge about any field which every person have in some field then he will survive happily and if a person will go to a way which is not for him then he will fail so gambling is a field where no one is fitted in there and so no one know that e will go to success or not so there is differences in life and gambling.