Make sure you eat local ones... the ones I buy from the store are always bitter and they're the ones transported from California, but when I go to a strawberry patch and pick my own and they'll taste 10x better! There are also different variations, personally, I love Hood strawberries - they're so sweet and soft
Strawberry season is spring and early summer, for peak ripeness. Where I live there is a strawberry festival every year, usually in May!
Are they supposed to be sweet? I've never tasted a sweet one. They're always so bitter that I cringe. I can't tell if I just don't like the taste or if I've never actually had a sweet strawberry...