How to pull through while struggling with depression

I've struggled with depression for about 4 years now. Around a year ago I was at my lowest. I was always convinced "it doesn't get better, even though people try to convince you" and "why try when everything is pointless anyways" 

I had this mindset for a long time, but by the end of the year I had began healing from it because I got hope for the future

I started looking for an apartment and began planning what life could be, or at least what I'd like it to be

Sometimes I still get my downs where I wonder "is it really worth it if I'll die someday anyways" but during those times, it's best to contact friends even if it's not to necessarily talk about that specifically. Just reaching out to someone and distracting yourself for a bit really helps. 

I don't want to say "oh you're just a teenager, everyone goes through a phase like that" because it's all about circumstances. Hormones do have alot to do with it, but loneliness or a bad home situation are the biggest factors. I also won't say your issues will all automatically go away when you get older. It's more like "you'll get more good days than bad, and eventually even the bad days don't feel horrible" 

Finding trustworthy friends is definitely one of the most important steps, but you also need to learn to regulate yourself in a healthy way. It'll probably take years, but nobody can truly save you but you.

To anyone who struggles with mental illness, don't give up. You need to learn to live for yourself to see that life does have a meaning.