What to do if i have a lazy eye, can/ should it be fixed?

Usually not: Straightening out the eye will not improve the vision in the lazy eye. You might be socially awkward due to the eye position and then correction would be appropriate. It would be considered a cosmetic surgery however. It is of course not mandatory to fix it.

Define "lazy eye": Most use the term for vision loss from one eye but some do for an eye that is not in alignment. Surgery can help with an alignment problem in kids and adults. The lazy eye (amblyopia) of vision loss can be helped if caught early. This is the brain turning off an eye with confusing input. Adults with long term amblyopia have permanent loss, even if surgery can lined up the eyes correctly.