"Vc é melhor do q isso. Vc precisa se valorizar mais..."

Some tentatively answers, subject to improvement by peer proof-reading.

  You´re way better than what you seem,

                                                   ...you need to give yourself the right value.

                                                  ... you need to highlight your qualities and skills.

                                                  ...you should market your yourself more effectivelly.

                                                  ...you should self-promote your strenghts a little bit.

                                                  ...you shouldn´t be afraid of let others know what makes you great, and why you´re the best guy there is. 

                                                 ...you might invest more in your personal marketing.

                                                 ...you should give yourself credit. (for everything you did)

PP.