ch does not exist in English at all, only in Scots. And it is spelled there the same way (cf. loch).
It is the velar frivative https://en.wikipedia.org/wiki/Voiced_velar_fricative https://en.wikipedia.org/wiki/Voiceless_velar_fricative
If, by sh you mean š, then no it does not.
Ch is what some languages (some varieties of Spanish), and also the International Phonetic Alphabet (IPA), mark using X: https://en.wikipedia.org/wiki/Voiceless_velar_fricative
C is https://en.wikipedia.org/wiki/Voiceless_alveolar_affricate#Voiceless_alveolar_sibilant_affricate sometimes marked using TS, in IPA using [t͡s].
Compare this record by an actual native speaker https://forvo.com/word/my%C2%A0chceme%C2%A0j%C3%ADt%C2%A0d%C3%A1le/#cs