Keep working on your footwork, exchanges, and accuracy....the arm strength will come (assuming you keep working on it).
My son was a "smallish" catcher but always had very good feet and exchanges which kept his pop times low. When he got to his sophomore/junior year he grew a little more and his arm started to come in. Combining that stronger arm with the good footwork/exchanges he saw his pop times drop to under 2.00 and stay very accurate.