Young, Chubby, and Worried😬😬😬

So I’m 17, 5’9, and about 165 lbs. I’m a bit chubby and I’ve always been self conscious. I’ve been playing competitive volleyball since age 12 and with that I have been working out extremely hard, and driving to a fairly healthy diet. I don’t understand why I continue to be chubby if i stick to a good lifestyle. I’m extremely worried for the future because I know it won’t get any better as my metabolism slows down😞. Could this be puberty (I feel like Im a little old for it to be that)??? Please help ladies, I’ll take any suggestions💕