"Too much choice" is only a problem if you are choosing randomly. You wouldn't do that with music (would you?), so seek out some curation and make your own playlists.
- the "games that defined the..." lists from www.racketboy.com
- Retro Gamer Magazine (subscribe, or look for their compendiums of back issues)
- old magazine reviews from Archive.org -- nothing quite reading the breathless reviews from back when the things were new to get excited for them (beware for when reality comes crashing in, though)
- List threads and Top Tens from discussion sites like this one
- YouTube and podcasts (though with videos, you might find you don't "need" to play some stuff when watching can actually be more fun)
You could narrow things down by system, year, publisher, genre, label color ... or by the things you actually played and enjoyed as a kid (if you were into gaming as tween, this is a very formative time for your personality)
Things like the Nintendo Classic Mini and Atari/Sega Flashback machines are nicely curated collections. If you don't know where to start, you could do a lot worse than beginning with the games on those.
Less is totally more. Make lists of faves, try to stick to one thing at a time, avoid the impulse to overdo it. You wouldn't stuff yourself past the point of comfort at a food buffet (would you?) so don't do it with games. Try to put yourself into the mindset of someone who paid between twenty and sixty bucks to buy a home game, or put a quarter in per play of an arcade game.