I'd probably say "My mom is trying to find me a boyfriend/set me up with guys according to what she wants in guy' But 'My mom is trying to choose who I date' explains everything! :)

Nearly correct, but needs a different preposition or phrase in the place of the 2nd 'for', and 'boyfriends' instead of 'a boyfriend' ('my mum chooses a bf for me' implies a descriptive statement of something observed or at a fixed point in time, not an ongoing process): 'my mom chooses boyfriends for me to/according to her taste' There are lots of ways you could say this, more natural-sounding sentences would be e.g. 'My mom wants me to date guys she likes' 'my mum uses her own criteria to pick my bfs' 'my mum is trying to find me a bf based on what she thinks is important' 'my mum uses her own judgement when trying to find me a bf' and so on.