"Shall I go?" vs "Should I go?" Is my interpretation below correct?
Shall I go? Means that I am determined/poised to go and ask for your affirmation.

Should I go? It means I want your suggestion.

Question

"Shall I go?"  vs "Should I go?" Is my interpretation below correct?
Shall I go?  Means that I am determined/poised to go and ask for your affirmation.

Should I go? It means I want your suggestion.

Answer

Yes. It is more clear using "we."
Suppose you and I are at a party together. 
1. I am bored and want to leave. So, I say, "Shall we go," meaning "i want to leave if you don't object."
2. We need to be somewhere in an hour, and there might be traffic. I say, "Should we go now, or do you think we can leave in 20 minutes and still get to our appointment on time?"

Ne manquez pas cette occasion d'apprendre une langue depuis chez vous. Découvrez notre sélection de professeurs de langues expérimentés et inscrivez-vous dès maintenant à votre premier cours !