are mRNA vaccines really safe?

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I am planning on getting a viral vector vaccine so I can get back to work. I refuse Pfizer only because to my logic, an injection of foreign mRNA into your body is not natural, while insertion of a weakened virus in order to form antibodies is more natural (which is done within the traditional viral vector vaccines). Is there any existing evidence that this mRNA injection is safe and doesnt remove itself from the body to further alter proteins made by your body? How do people know theres no long term negative effects? Should I still stick to AstraZenecas viral vector vaccine? I hate all of this shit and need help I would never consider getting vaccinated but I have to for my family.

Thanks in advance anon