First of all it depends if you are a male or female. Candida yeast infections are more common in women than men and it is much easier to diagnose specially in women case. However, the thing you gotta know is that there are various different manifestations of yeast infection.
For instance you could be suffering from yeast infection if you have following signs and symptoms:
consistant itching in private area or around body
discharge (white thing coming out of your vagina)
disgusting smell down there that others can smell easily no matter how much perfume or other products you apply
constant bloating and gas
There are many other symptoms you can check webmd or eric bakker site and see what he lists as signs and symptoms but what I have listed are the major signs of candida yeast.
Another thing most doctors won't tell you or even other website is that at times you could misdiagnose yeast infection. It could easily be leaky gut syndrome or bv or some other infection. I recommend you seek a professional ND/MD to help you. There are various tests out there such as:
candia5 home test and i have seen some sites have 5-8 home tests you can try to see if you have yeast infection if you find you have some of the symptoms.