If you're suffering from depression you shouldn't treat it lightly, not going to the dentist because you don't want to have someone look in your mouth or spend money on SPAM is a donkey move, same thing here.
Medication and psychotherapy are not the only ways to combat depression, here are some suggestions you can implement immediately, but I stand by my recommendation that you see someone for a legit diagnosis and then make your plan.
Depression Busters:
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Exercise: any activity can have an incredible impact on your mood and energy levels. If you're not exercising to some extent every day you're sabatoging yourself. Added bonus: hotter bod
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Vitamins and Minerals: I take Vitamin D and a Multivitamin daily, if you live in a climate with lots of sun and you're out in it regularly (see the first suggestion) you can probably pass on the Vitamin D, but the multivitamin is a must. Added bonus: too many to list, vitamin deficiencies can cause some really fucked up problems.
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Get sufficient sleep: This is different for everyone, recheck your assumptions about how much you think you need, try getting on a regular schedule and really make sleep a priority.
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Cut out depressants: Alcohol is ubiquitous in our culture (mine anyway) but it's a powerful poison, it can make you fat, fuck with your sleep, slow your healing/recovery, and it most definitely can fuck with your mood and energy level. Try not drinking, it's honestly a lot of fun to go out without getting smashed. Added bonus: You can drive her to your place

Also, If you use MDMA or similar substances recreationally, try stopping for a few months and see if you notice any improvements.
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Proper nutrition: This goes hand in hand with vitamins, but it's supercharged in both the benefits of getting it right and draw backs of fucking it up. Do you get sufficient calories everyday? Low blood sugar can
really mess with how you feel, make sure you're eating often enough so you don't go too long (4-5 hours) without getting some fuel for the tank. Eat vegetables, every day.