I'm filling my linkedIn profile and in the summary I'm about to add the following text:
I’ve always been fascinated by the opportunities brought by the digital age. Now when it’s easier than ever to connect with people instantly and anywhere, gain knowledge and skills previously only accessible by limited groups of people and existence of the machines that save and improve lives for billions, (...)
wouldn't it be informal or strange in any way for a native speaker to see the idiom "dead sure" following it, like:
and I'm dead sure that I want to get involved.