I would like you to let me know about the shaking hands for the purpose of salam with our female co-workers or classmates, without any lustful intention. Is it permissible? Sometimes my female co-workers and classmates come to me and put their hand forward to shake, honestly on that time I couldn’t resist and unintentionally shake with them. I thought this would dishonor someone to not shake when they initiate.

No, it is not permissible. You can tell her excuse me, I am Muslim and not allowed to shake hands with foreign females.
I always do so. There is no dishonor in it.