At your age, you would have to start prioritising things a bit.
You are early in your powered flying career. Although gliding is great and will certainly increase your skills it is not that cheap, and (potentially) will distract time and money.
Of course, if you have shedloads of money, then do both, but aviation will take all the money and time you can throw at it. It is a well-known adage that if you want to end up with a small fortune, then start off with a large one, and fly.
Doing both gliding and powered flying just accelerates the process.