I don't think you should regret your first deer with a bow, regardless of what it is. However I do prescribe to the theory that if you kill a young buck, you will never have the chance to harvest him as an old buck. Its commendable that you're even thinking about this and asking the question. So be happy about your first deer, and be more selective on subsequent deer, and sleep well.
I agree you should be happy and proud of it as your first deer. However I disagree with an implication made in other posts about him being young and dumb and wouldn't have made it. Every young deer is young and dumb, many survive to maturity in spite of it. Every world record deer survived through the exact same stupid period in their life. The ones that survive to maturity so so more out of luck than anything else, either live in low pressure area or another hunter passed him on occasion. In the scheme of things, young hunters taking young deer isn't going to amount to a hill of beans and in my opinion the gains made in experience for young hunters (paying their dues) gaining experience and knowledge is worth more than that young buck as applicable to future management and ethics and hunter development overall. I'd prefer to have experienced and ethical hunters in the woods with a young kill or two on their resume (in their portfolio) as opposed to older beginning hunters with no experience chasing big old bucks and making unethical and unclean shots and decisions. I applaud you for being management minded and making this question a consideration. It's part of healthy growth as a responsible outdoorsman to ponder such things. Hunt and grow and continue to think and ask questions. BTW, congratulations on your first buck harvest and job well done!
Killing one buck does nothing to the herd...every doe it may have bred will get bred by another. Overall just continue to take what makes you happy...if you desire to see more mature bucks look into associations like QDMA and other management programs, not to necessarily join them but to learn from them.
