My first time growing chilli plants. The seeds I collected from market chillis have come a long way since being planted in February!
Are the fruit similar to the ones you bought? Because with bought produce, often you will find that plants from their seeds will be wildly different with wildly different fruit. If they are, you have one that's true to their seeds, and probably well adapted to your local environment, so collect their seeds and keep them going, and far away from other peppers! If not, you bought an F1 hybrid's fruit, don't be surprised!