make a finished game? yes, the engine is capable of this. are you, too?^^
support: friendly ask question, friendly answers will come back.
only X years old? i know childish Xyo and Xyo with parental behavior, as i know (stupid) grownups stayed underage in mind. where you are?
one thing in making a complete game is
endurance, even when it gets boring or problematic (it will^^). endurance is mostly a comon problem of many people.
other thing is life-experience. you cannot have that much with low age. interesting plots and stories are made of this. but try, we will see (if you are smart you dont need a big plot for a shooter

)
i wish you all the best for a big project like this.
maho
edit: deleted tri“s age.