If I was deferred and get a few Bs first semester. How bad will that look?
Certainly won’t help.
Likely will not get accepted outright. Might get in as a sophomore if you do well at whatever college you end up attending. Cornell has that funky option they sometimes offer. Those first semester senior year grades are crucial
I agree with others that you should be expecting to attend college or university somewhere else next year. Make sure that you have your other applications in including at least two safety schools. Fortunately there are lots of excellent universities that will be okay with your having a couple of B’s.