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Am I behind?

I have a total of 24 four stars at level 43, 12 of which are only r1 10/10, should more be r2 and above?
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Everyone plays the game differently so there's no right answer here, but if you're concerned about efficiency and whether you're doing things in the way that will allow you to progress fastest, then you should be ranking up champions that can give you an immediate increase in the kinds of content you can do. If there's a level of difficulty you can't do or some content you can't tackle or would be very expensive to tackle, and you think a rank up will help you in that area, then that's where you should be ranking. If there is no such option, then you should in general be saving rank up resources until such an option comes along, or you're full and in danger of resources expiring. When that happens, you rank up whatever option is best, or whatever option you think might help you in the future.
But without knowing what your roster looks like and what your skill levels are and what content you're currently tackling, there's no way to say whether your rank up decisions are strategically good ones. Everyone's different in that regard.
Are you spending/using a lot to complete the content you attempt? Are you hoarding resources or crystals?
I open crystals as soon as I get them, so no hoarding, I dont spend alot on potions or boosts if that's what you're talking about, but I do occasionally spend some units on 4* shards when they come around in the shop. I also only use energy refills when I NEED them so I dont use too much to complete stuff