Quitting all my main ECs after committing

Basically, I got admitted to my dream school last month and I am going to commit this week. In high school, I committed tons of time to activities that I hated so that I would be more appealing to colleges. It's not something I am proud of but it's something I did and it ended up working out for me. I am pretty much going to be quitting all my major ECs, so maybe like 7/10 of the activities on my common app list. Is that something that colleges pay attention to or not? I can't get rescinded right?