how do i decrypt encrypted texts and where are they coming from?

im using a samsumg j3 verizon network, verizon messaging app but also have allo and vouce/hangouts instlled. keep seeing encrypted texts FROM ME, that i havent sent or written. DYING TO KNOW WHAT THEY SAY!!!! they are from someone called Udj which I have seen somewhere else idk where and they are just numbers and letters no symbols except a random - here and there. any help would be welcomed!! and im not very tech savvy, well i am but not, dont know alot of tech terms and stuff

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