Xaero,
While linkon07 is giving u many good guidence, Let me put my 2 cents here.
I saw few words coming in your discussion. Here is how I will arrange them in proper hierarchy. With each level, u can keep exploding it further and get down to the details.
You can visualise as if house of MBA contains many rooms, when u enter finance room, you see few more smaller rooms and so on and so forth..
1) MBA - Finance / Marketing / HR / Sales / Economics / Statistics etc
2) Finance - Corproate Finance / Banking / Accountancy/ Investment / Company Analysis / Insurance etc
3) Banking - corporate banking / retail banking / wealth mgmt or HNI banking / Loan / Deposits etc
4) Investment - Capital Market / Fundamental analysis / Tech analysis / risk mgmt/ Trading / Investment instuments like stock, derivatives, forex, commodities etc
Hope this helps in getting bigger picture and taking right decisions.. Don't try to master everything. We got to choose our focus area and master that. It always helps to know the surrounding areas to get an edge.
(Above are some of the thoughts that came on top my head in 5 mins.. the list is not exhaustive but hope u get the idea of how to see the bigger picture and find your way out in this jungle).
All the best..