Gosh, I'm sorry to hear that. That must make your days really hard. Yes, I think a therapist would be a good idea. Because then you can have an outlet to share what is going on and dig deeper. Does it stem from changeable things in your life? Does it stem from depression so it doesn't matter the circumstances of your life? These are questions to explore, Most people have days or even periods in which they don't feel good about things but two years is a long time. I'm here to chat if you need it!
Do you have any hobbies? Also, unfortunately, this mood is extremely common around this time of year. Though, I would be remiss for neglecting to mention that mine is more confined to the Fall/Winter-transition period. I’ve heard it referred to as Seasonal Affective Disorder (though, please don’t take that as a diagnosis).
I have to agree with Paxiled to an extent that when we have a new baby, our lives change because we are the ones who have to care for this helpless person. It's not uncommon for the mother to take on the bulk of the care for the baby and help support the father as he goes on with studies, working to advance in his job, start a business, etc.
That doesn't mean you have to completely give up your hopes and dreams, though. If you haven't talked to the baby's father, you'll need to do that and make sure he understands that you have goals in life, too. If both parents work together, they can raise a child and still, each reach their own personal goals. He'll need to know what your expectations of him are, if he doesn't already.
I am in agreement that therapy would be a good thing. Good luck.