Hi Emily, welcome
Do you have an OBGYN or another doctor or therapist to talk to about this? Sometimes after pregnancy women can develop post-partum depression. It doesn't mean anything bad, it means your hormones are out of whack and you may need drugs to regulate them for a while, or therapy to deal with your life right now. It is not a personal failing to ask for help, ok?

I'm glad you love your son, but he needs his mom - and you deserve to be happy. Happy be-early birthday.
Otherwise, being a teenage-mom means a lot more stress and dealing with stuff that not everyone else who's a mother has to deal with. What about your family? Can you talk to them or ask them for help? Friends? Relatives?