核心问题
You're on record as saying that you will retire from football at the end of the year. 我没有看懂上句话的意思。
词典解答
要想理解这句话,必须掌握 be（go）on record as doing sth. 这个句型。它的意思是：“公开表明”“公开说”“被记录在案”。
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The team manager went on record as saying that he had never seen any team play as badly as his team had done during that match. 球队经理曾公开说过，在那场比赛中他从未见过哪个队打得跟他的队一样糟糕。
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Lord Goodman has gone on record as saying that music and the other arts need much more active support. 古德曼勋爵已经公开发表意见，说音乐及其他艺术需要更多的积极的支持。
[句意]你已正式宣告你将在年底退出足坛。