Debugging a boost converter (TPS61220)
In order to regulate the output voltage, the IC needs to know what that voltage is.
Some ICs have an internal connection to this point in the circuit and usually an internal fixed voltage divider network which is compared to an internal reference.  

If the IC is intended to have an adjustable output voltage (like yours), the usual method is to have the user/designer incorporate their own voltage divider, allowing a range of output voltages to be selected.
You choose the resistor values to achieve a division ratio such that when your desired output voltage is achieved, the value produced by the voltage divider matches the value of the IC's internal reference.
This divider of yours is connected to the feedback pin on the IC.

BUT - you have connected your voltage divider to your input supply voltage instead of the output - so your IC has no idea what the output voltage is.
Its not getting any feedback, so it can't regulate.