A lot of what I'm going to say is based on my personal experience. I've been living with depression for over half of my life, often pretty severe, so I want you to know that this isn't coming from someone with no experience who feels qualified to tell you what to do with your life. (Trust me, that pisses me off too sometimes.)
Exercise, eating healthy, yoga, finding a creative outlet, and stuff like that can help, but they only help when you already have enough energy to spend on doing them. For a long time, that wasn't me. (Sometimes, it still isn't.) They're good things to keep in the back of your head when you feel like you have a little more energy than usual, but they won't pull you out of your worst moments.
It sounds cheesy, but affirmations can actually be pretty helpful. At first, it'll feel awkward and insincere. But it's a "fake it 'till you make it" type of thing, where over time the words feel as though they have more and more meanings. A part of this process is identifying how you feel and finding ways to disrupt negative and unhelpful thought processes. This is called cognitive-behavioral therapy (CBT), and it's one of the best things that's ever happened to me. I know you can't afford therapy, but fortunately there are free online resources that can walk you through the process, and in studies these online programs had a shockingly high success rate comparable to their in-person equivalents. This isn't like talk therapy, where you talk about what's happening in your life to someone who provides you with a supportive ear and a sounding board for ideas. CBT is about providing you with tools that you can use for the rest of your life to help you take care of yourself. One online resource, which is one I can recommend, is https://moodgym.anu.edu.au/welcome.
Another big thing that can help is to find something small that you enjoy. Something that doesn't require a lot of you, but makes you feel even just a little better. As an example, mine is showering. When I come out of the shower and I'm all clean and freshly shaved, even if I was having a terrible day before that, I feel like I have a little more energy and motivation than I did beforehand. For one of my friends, it's cooking something a little extra-special and treating herself to something she doesn't often do. Whatever the equivalent of that is for you, know that that's enough, and also know that it's okay if you take a while to find out what it is. One of the worst things you can do to yourself if you're experiencing severe depression is to feel guilty about the things that you aren't doing but feel like you ought to do. Being alive is the top priority, and anything else is a bonus. Prioritize your survival. You deserve it.
Do you have health insurance? Generic brand antidepressants are fairly inexpensive if you do, and you can often get a prescription for it from your general practitioner. Changing medications or starting a new medication can come with side effects, and sometimes things can get worse before they get better. Usually, you'll be started on SSRIs (think Zoloft, or its generic name sertraline) because they have fewer potential adverse effects, but if those fail you might be moved to MAOIs (think Emsam, or its generic name selegiline). MAOIs in combination with alcohol are bad news, which is honestly the primary reason why they're not prescribed initially (SSRIs seriously lose effectiveness with alcohol whereas MAOIs can be potentially fatal with alcohol, though honestly given that alcohol is a depressant you're better off avoiding it as much as possible anyway). Speaking of, weed, GHB, and lean (codeine) are other popular drugs that have depressant qualities that you probably want to avoid. (Weed is also technically a stimulant because it accelerates your heart rate. It's weird, don't worry about it. Probably stay away from it though.)
I know it can be easy to feel isolated. Depression can make us behave in ways that we don't want to. But if you or anyone else reading this thread having a similar experience need someone to talk to, please don't hesitate. I try to be on the forums a few times a day. I can't guarantee an instant response, but I can guarantee that I genuinely care about you and your well-being.
Love and respect.