Praise be to Allah.
Allaah does not forbid people to do a thing which they cannot give up, and He does not enjoin them to do a thing which they cannot do. Hence it is the Shaytaan who is making you think that you cannot repent, and what is there that is stopping you from repenting?
But you have to follow the means which will help you to keep away from this sin. One of the most important things in this regard is marriage. If you cannot marry, then follow the advice given by the Prophet (peace and blessings of Allaah be upon him), which is to fast. Try to fast some of the days when it is mustahabb (recommended) to fast, such as Mondays and Thursdays, or three days of every month. Keep away from things which will provoke your desire, such as looking at haraam things or at scenes which will provoke your desire or thinking about your desires. Keep your thoughts busy with things that will be of benefit to you, and look for a righteous companion (wife) to help you to adhere to the path of obedience.
As for your good job, it has nothing to do with this. It may be the case that Allaah enables a righteous man to find a good job which He denies to a sinful man. Provision is in the Hand of Allaah, may He be blessed and exalted, and He may test some of His slaves with ample provision or with straitened circumstances.
The sign that your repentance has been accepted is that you give up that sin and never go back to it. Since you missed out on repentance during Ramadaan, strive hard to achieve it at other times. We ask Allaah to accept the repentance of us all. May Allaah bless our Prophet Muhammad.