I shouldn't said it myself.和I shouldn't have said it myself.有何不同?

I shouldn't said it myself.和I shouldn't have said it myself.有何不同?
I shouldn't said it myself.和I shouldn't have said it myself.有何不同?

I shouldn't said it myself.和I shouldn't have said it myself.有何不同?
后一句是虚拟语气,表示做了本不应该做的事情,自己不该说但说了出来.前一句则不能确定说没说出来,也可能表示人的内心想法.

第一句是我不应该说，没说，第二是说本不应该说却说了，这个是should have done结构，表示不应该做却做了。希望帮到你了

前句
这事我不应该自己说。
后句
这事我不该说出来。