When does someone feel it's time to get rid of their car?

I've been a little anxious over this.. I have an 09 Mazda 3 with 115k miles and I LOVEEE IT buuuuut it's a New England car so it has rust on itt.. I bumped my dads truck with it so I have to fix that cause it's also rusting.. the ac compressor is dead.. the car now makes an odd noise when turning at... show more I've been a little anxious over this.. I have an 09 Mazda 3 with 115k miles and I LOVEEE IT buuuuut it's a New England car so it has rust on itt.. I bumped my dads truck with it so I have to fix that cause it's also rusting.. the ac compressor is dead.. the car now makes an odd noise when turning at certain points and I think it's the cv joint... I had an older car that rung me around $2k of things to fix on it.. called it quits and sold it.. how do I avoid this happening again?
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