Basically the reason you "owe so much" is that the amount of tax you had withheld during the year, or paid in estimated tax payments, was much less than the total tax on your income for the year. Did you have any tax withheld from any of your income sources? If not, that's why you owe "so much." You are paying all the tax for the year now because you didn't have any tax withheld during the year. And you probably owe a penalty in addition for not having had enough tax withheld. Even if you did have some tax withheld, you must not have had enough withheld to cover the tax on all your income.
If you want a more detailed explanation or analysis, post some details as xmasbaby0 suggested. Include the specific type and amount of each income item, and the amount of tax withheld or estimated tax payments that you made. Do not post any personal information or contact information. This is a public web site that anyone can view.
