Your argument is:
(1) Our senses and perception are subjective.
(2) Everything we know is based on on our senses and perceptions.
(3) Everything we know is subjective.
There is a well-known difficulty with this argument. It equivocates on "subjective". In the first premise "subjective" means something like the innocuous "possessed by a subject", but in the conclusion it is presumably taken to mean the toxic "not having any objective truth". There is also a doubt about the second premise. Many philosophers accept the idea of "a priori" truths, that is, truths that hold independently of experience, including mathematical truth and perhaps ethical truths, if there are any.