No. This is a normal game that high schoolers do when starting to think about the priesthood. And sometimes adults too. Playing this game is typically only a good idea when there is absolutely no way to find an answer in some other way. In the end, it sort of betrays our rational nature… God wants us to love Him by knowing Him in a rational way, not an arbitrary (“willed”) way, as signs like this would be. Use your brain, working in faith.
At 15, you need to be focused on building normal human skills and growing in virtues (like anyone).
If you are thinking of priesthood because girls won’t talk to you (or worse, you won’t talk to girls) then that is something to work on and figure out. The more normal you are in this regard, the better a candidate you would generally be for a minor seminary.
Your diocese probably has programs/events for high schoolers interested in seminary. Ask your parish priest about it. Also try to become more involved in your parish overall… serve Mass regularly, volunteer to help with events, frequent whatever youth group stuff is going on, etc. And eventually you will need to have a real conversation with Father So-and-So about this. But there is no rush.