Well if it makes you feel any better, the newer Pokemon games are very different to the old ones. Competitive battling is hugely more complicated and websites like Smogon spend inhuman hours working out every last little, possible, detailed strat.
Anyway, here's the latest gen compared to the first: (because I've been wanting to list this for a while

)
1. 342 more Pokemon (God knows how many more when the next games come out in September for Japan).
2. 2 more types (Steel and Dark).
3. Pokemon now have genders.
4. Increased IV's. (Giving Pokemon, larger maximum margins for their stats).
5. Shiny Pokemon! - Each time you see a new Pokemon, there's a stupidly, improbable chance it'll be different coloured.
6. You can now breed Pokemon, during which you can pass down stats and moves.
7. Countless more moves / attacks.
8. Pokemon can now hold items and use them in battle themselves.
9. Added natures which increase (and decrease) stat fields.
10. Pokemon now have abilities.
11. Double battles added!
12. Pokerus - a virus that boosts your Pokemon's EV growth, can be found on wild Pokemon. Although its as improbable as a shiny Pokemon appearing, it can spread to your other Pokemon once you have caught it.
13. Moves and now uniquely split into attack / sp.attack as apposed to entire types classed for the same field.
14. Crazy new evolution methods!
*coming soon*
15. Triple battles!
16. Possibly more.