How can you find out if you have a sixth sense!?

Hello, I'm 15 years old nd will be turning 16 soon in oct. but ever scence the young age of 7 once my birth dad had ped on i'v been seeing nd experenceing the unexplainabul! I even predicted my great ants death! One, day we where haveing a family party i don't remeber what the party waz for i think it waz easter! but for some strange reason i kept staring at her for almost the hole party just in wonder! bec something told me that she might die or something bad's gonna happen to her! nd then soon enough i find out she ped on 3 weeks after the party. I'v had other Crazy experences as well! but have way to many to share!...... So, anyway how do you know if you have a sixth scnse!?..........