There are two basic single throw switch circuits: normally open and normally closed. You need a NC switch.
You bought a NO switch, when you activate it, it closes. Are all the switches the same, or was it an assortment. If not the same, likely one is NC and will work. Many switches have multiple contacts, so they do NO and NC at the same time.
Maybe possible to reverse circuit to work with diodes, but why bother? Switches are not expensive.
3 diodes is not a transistor, it's 3 diodes. Build your 3 diode transistor some time, and you will find it doesn't work as a transistor! The models they use to teach about semiconductors have some valid characteristics, but are generally grossly flawed. You need to know when each model is valid.