I feel your pain also because this happens to me all the time! Sometimes I rip out. If I see things are off, I use a scant 1/4 on some seams. Sometimes I just fudge. Sometimes I change the whole concept of the pattern to make it "fit" what I have.
I do have a 1/4 inch foot, but it is not correct or I don't sew it correctly or I don't see it correctly. Whatever, I did the measuring from the needle and putting down tape also. That helps as long as the material is CUT correctly, which is another problem for me for whatever reason.
Just do your best. That's all we can do.