If i eat more will i grow even though i'm not in puberty?

Generally Not: I assume you mean skeletal growth (i.e. Height). The majority of skeletal growth is complete by ~18-21 years, but continues minimally until ~27-30 years of age. Unless you have an endocrine or other hormone disorder, it is exceedingly unlikely for you to grow in height after that age. Remember that you will grow in girth (i.e. Become obese) so please eat a healthy diet and stay active!