The main purpose of Istekhara is when a person is confused between two parallel options otherwise what will happen in near future other that Allah (swt) no body knows. Even it’s a great blessings of Allah that we don’t know about our future. Only recommended thing is that we should rely on Allah and leave our affairs on Him. Our duty in this life and in this duniya is to struggle. As for as your marriage concern take advise from your elders and after having satisfactory information about whom you want to marry you may proceed. But don’t do anything just emotionally.