I have a missing tooth. Do I need to get an implant?

I got a tooth extracted when I was around 13. I lived with the gap with no problems, and got braces when I was 16 (the gap still remains.) Now that I'll be 18 soon, my doctor said I need to get a tooth implant. And that if I don't, my teeth will be misaligned. But I'm really scared of operations (due... show more I got a tooth extracted when I was around 13. I lived with the gap with no problems, and got braces when I was 16 (the gap still remains.) Now that I'll be 18 soon, my doctor said I need to get a tooth implant. And that if I don't, my teeth will be misaligned. But I'm really scared of operations (due some reasons), I don't want to have surgery and I don't want to deal with it post-op. Is it necessary for me to get an implant?
Update: By the way: I'm missing the second molar.
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