Extraction of premolars in upper and lower jaw for reducing crowding and aligning front teeth. Any suggestions? (photos)

I'm looking into getting braces and my Orthodontist has recommended extraction of lower and upper two premolars,but i dont want to get extracted my premolarteeths .Because Im scared if it might spoil my jaw and other teeth in future ! Is there any alternative solution to this overcrowding teeth of mine?I've attached my dental picture

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