Key wont comeout of the ignition switch, do i need a new switch?

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If you are saying that the vehicle will turn over only when jump started and nothing when not connected to another vehicle then I would check the earth connection from battery!

GM cars have bad problem with security system. If you key turn light and will start other time will stick and need shaking to turn over and won't start just replace the key. Security system need some times to refresh the memory.
1.turn key ON for 10min.
2.turn key OFF 10sec.
3.turn ON 10min.
4.turn OFF 10sec.
5.turn ON 10min.
turn OFF ON and start
total of 30 min. to refresh the memory
the next step is more expensive and need some skills.
on top of the ignition switch is a sensor go bad
replace ignition switch with the sensor and do the learning process from step 1 to 5

Bad ignition switch not the key switch the ignition switch i would check that first.Then the key switch.

try another key. the key could be worn where read coil in the ignition switch lock cylinder and immobilizer control module and ecm dont recognize ignition key or ignition switch key lock cylinder failing.

Try starting it with the shifter in neutral. You might have a bad
Neutral safety switch.

Not an exact solution, but perhaps information that might lead to one.

1.Replaced the tumblers? I believe I would replace the entire ignition switch this time. It's my belief that the body of the ignition switch is worn inside, and will keep damaging the tumblers.

2.Do you have a tilt steering wheel? It's best to keep the steering column in straight line when starting the car, then tilt the wheel to where you want, after the car is started. When the steering column is in a tilted position, it puts undue strain on the ignition key switch, and the mechanism the ignition key switch operates, on GM vehicles.

This mechanism, consists of a half moon gear on the ignition key switch, that turns inside a 'Planetary' gear. I used the term 'Planetary', as the gear shape is hard to describe. It resembles an oblong loop, shaped like the number 9, with gear teeth on the inside bottom of the loop. This 'Loop' rotates, when the gear teeth of the ignition key switch, engage the teeth on the loop, and pushes a rod, or retracts the rod. The rod goes down the side of your steering column, and turns on, or turns off an ignition switch, located at the bottom left side of the steering column.

Having the steering wheel tilted, puts a strain on the ignition key switch internals, the oblong loop can break, and/or gear teeth can be stripped off.

Is your theft light flashing. If it is try this. I learned this from emission wiz Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. This relearns your key to the ignition it started with Gm cars and trucks from 1999 to to 2006. It is a big problem but there is no recall that I know of. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys

Its likely that you have either a bad ignition switch or a bad neutral safety switch (if stickshift, clutch switch) Try starting in neutral...if it starts, change neutral switch (jump across clutch switch, check starting in neutral with your foot on the brake) Ignition switch is on top of steering column under dash.

you need to buy a new ignition tumbler