PR/Business Development coach for writers and artists; CEO, Creative Center of America; member, Forbes Coaches Council.
No, you do not. Likewise, you do not have to write books other people will read and you do not have to create work that is anywhere near commercially viable. Your critique partner is trying to alert you to the alarming way your work is turning out. Your story may ramble and wander about. Your work probably lacks the structure needed to give readers the experience they demand. What can you do? Start by exploring the notion that story structure and formula are not exactly the same thing, and neither are evil. I think formulas can provide an important illumination for your chosen genre. If you are a new writer, following a proven formula can allow you to lean on something that works while you develop your skillsets. Structure is a different kind of thing. It is a design requirement to make sure your work has the scaffolding needed to support a reader. Like an architect designing any building, writers must accept that writing projects require a certain framework to function. So formula is like building a line of cookie cutter houses. Structure is the engineering rules you follow that allows iconic buildings and cookie cutter houses to stand up at all. All to say: listen a little more to the critique partner and explore what you are being told.
The advice about structure that your critique partner is yammering about is a must if you want to be a successful writer.