Find a Shadchan you personally know [or/& thy Rabbi’s wife], and speak it over with her, and encourage her, to act as go-between, and suggest it to both parties (even if this will end up with her having to receuive a fee from your brother [or parents] and the girl’s side)
Despite Farrocks advice:- Difficulty here:- Discrimination against taking your suggestion seriously on account of thy young age.