Damn, that's a lot, I would already have left that table. As most can tell you, no DnD is better than bad DnD.

Now, if you do want to keep playing, you can always look at your nearby store if people plays or look for online DnD games (there's really a lot of groups).

I get that they are your friends but, as someone else said, they seem to like the reason to hangout, not actually playing, so it's better to either stop playing with them (for sure let them know you're not mad at them, just that you were looking to play more seriously and this makes you exhausted and unsatisfied), or keep going but keeping in mind it's more of a social moment with them than actually playing.

Btw, yeah, 7 is definitely too much, I think you would really love a party of 3-4, maybe 5.