Question about amino acids?

I am very confused because I heard that there are only 20 amino acids, but others tell me there more.Here A list of the ones I know: 1) Alanine 2) aspartic acid 3) Asparagine 4) Aspartame 5) 6) Serina cystine 7) Methionine Histidine 9) Threonine 10) Glutamine 11) glutamic acid 12) Isoleucine 13) Leucine 14) Proline 16) Valine 17) Tyrosine 18) Tryptophan 19) Lysine 20) Phenylalanine So if you know anything please. Thanks in advance reprobed

I think there are 20 amino acids in our body is not in the world. So do not worry that there must be many others, but I do not know the name of any other.

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