How can I overcome the difficulty of lowering my gaze and the desire to get married, knowing that I am shy to broach this subject with my father, and I have left my studies and started working?

If you are able to marry, then hasten to do so, for it is more protective of your private parts and more lowering of your gaze. If shyness prevents you from speaking to your parents about this matter, then have one of your relatives or a virtuous person speak with them on your behalf. Until marriage becomes feasible, you must practice self-restraint and patience, and fast frequently while guarding your hearing and sight. Be keen to associate with the righteous, and occupy your time with beneficial deeds.