Day 5 is still very early days. I was on fluoxetine for four years. It is quite a stimulating med that's for sure. I was maybe more nervous than I'd like but it had lots of good aspects too. Give it some weeks and see how you feel then. Maybe keep a mood diary. If in some weeks you don't feel how you want then see your doctor about changing it. No point staying on a med if it's not leaving you feeling how you want.