How do I practice self-discipline? How do I sustain self-worth?

It makes sense that one could possibly fall for someone that at work. We are at work for many hours of the day and there could be a lot of time spent with this person, possibly in close proximity, and possibly sharing goals / vulnerabilities / perspectives throughout the day. These situations can be very tricky and some are forbidden for very good reasons, for example with a therapist and a client.  If you truly wish to proceed with a relationship with someone at work, be very aware of the policies and consequences at your place of employment. There are also professional and reputational consequences to take into consideration for both parties. 

If you are aware of these risks and still choose to have the relationship make sure you've thought through your motives.  Are you genuinely interested in this person?  Are you sure this is not related to anything job/profession related?  Are you certain it's not a mentor/mentee type affection? Take into consideration the possible difficulties of perceptions of co-workers.  Can you and the person for whom you're attracted withstand and be able to take on some possible "office gossip" for awhile? 

Secrets are no good.... for anyone in this situation.  It would be important to let your manager know your intentions and talk through the consequences, possibly discussing transfer/alternative options to save your job. I do believe there is more than just 1 person in the world for each of us.  So I'd definitely ask yourself if this is truly worth risking your career.

It might take spending some time to figure this out before acting on your desires and it's likely time worth taking. Wanting to be in a relationship is very normal and healthy, but risking a big part of who you are in your career is definitely a weight.  I'd want you to be very sure you've communicated and processed these challenges with the person of interest before taking the plunge into an intimate relationship. 

Being open and honest about your feelings with yourself and the person you are interested in is most important.  Talking this through, will likely bring you both to a place where you can problem solve the necessary steps that feel safe and right.