I don't think there's any need to label it. You said you are bored; dissatisfied with life. It sounds more like you are just unhappy with your current situation and that something needs to change, but it's hard to determine what that might entail. Do you have a good therapist? These sound like issues you can work through, especially with professional help to guide you and for you to talk through these things so that you can identify what changes you can make in life.

I can relate to a lot of what you say, and it's normal to question whether it's dysthymia or not. It's typical for anyone to go through phases of dissatisfaction with life or feeling that something is 'missing.' Sometimes we have to be careful not to pathologize these feelings, since it's just part of being human.