SMN is a weird dps class so I can see how it can make one's effort feel like it doesn't matter. I would suggest trying to level another dps class, maybe the opposite of summoner which is like a ninja, sam, monk, or dragoon.
You're probably like the Au Ra in that Steppe village who was trying to be the best swordsman like he was in a previous life but the moment he tried fighting as a monk he was the best fighter in the village.

But if you like SMN and have an affection for it don't give up. Sometimes guides don't help, sometimes what you need is people in your server to tell you what they do on summoner and what to use when, etc
Guides make it seem like you need to copy and paste what they do, but what we need some times is to understand whyyyyyyy things are made in that order and how to add other things.
Don't feel bad, I don't raid and yet people know me as one of the best warriors they know, just give it time. It took me half a year to be decent at dark knight, yes sometimes it takes that long for something to click. The skills you rarely use, give them a second look.