mate - i was 17 once, i did exactly what you did (don't make me put pics of my rover up ) and i have learnt from my mistakes!!!!

If it was my car, i'd put the original grilles back in, put a set of 17s on it and get it lowered

After that, maybe tints, smoked lights and sound system etc. As you are only 17 engine mods are out of the question.

Rich