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Some guy came up to me today while I was deadlifting. He seemed reasonably competent and told me I was starting with my butt too high and using too much of my lower back. This was definitely an issue when I started and I think I've slowly gotten into bad habits. And, I definitely feel it in my back today.
Beware. Your form might have been just fine. For some body types the deadlift is more hip centric. You just need to make a form video and get the opinion of reputable people. The deadlift is largely a back exercise so it's fine to use your back to move the bar, as long as you aren't rounding it excessively.