That is not impossible. Trust wallet does not offer such a feature to buy and sell your crypto coins. All you have to do as suggested is to look for exchanges and send your BTC to such wallets. Note that the wallet must have the peer to peer trading feature. Examples are Binance, Remitano, Okex, etc but I will recommend Binance. I have been using that for many weeks and I have encountered no problems. And when you do, do not send your BTC to your trust wallet again if you want to be selling them. Use the exchange wallet instead