I was very depressed from a very young age, the cause of my depression was 'someone' and how that someone treated me from the age of 6yrs to 16yrs. When they were removed from my life I continued feeling depressed (along with other mental health issues) for another 10 years. I honestly thought it would never ever go away, I was so exhausted from it.
Gradually though the good days increased and the bad days decreased. It was a long process, medication helped me but it took a long time to find the right one for me. It also took a very long time to find the right psychiatrist and there were days I just wanted to give up.
So to answer your question, yes, it can get better. I never would have believed it myself back when I was in my pit of dispair, it just didn't seem possible.
Aside from medication and psychiatrists there is a lot you can do for yourself - I really believe that the most instrumental person/thing in dealing with depression is the person themselves.
I never have a 'bad day' any more, I do have days where I feel a bit low but nothing at all like before.
Things that helped me -
Forcing myself to get dressed every morning and go to the shop. It made me go out and forced me into a routine. The fresh air did me good.
I wrote (still do) 3 things I am grateful for every single day.
I made myself be just a little more social. My automatic response to an invitation was 'no thanks' - now I will occasionly say yes.
I am kind to myself. WOW did I used to beat myself up mentally, no wonder my confidence was zero. I will sometimes look in the mirror and tell myself I'm looking great today. I can now accept a compliment (a big thing for me).
I ditched black clothes. I wasn't goth but I could understand how I could be mistaken for one. I went to the charity shop and bought brighter clothing, nothing neon or anything like that but whites, yellows. It really perked me up.
Taking care of my appearance. I never used to give a shit, some days I still don't. However I do always feel better if I've just put a bit of mascara on and styled my hair rather than just scraping it back in a ponytail. I'll never be a fake tan, full face make kind of person though.
Sticking up for myself. I learnt how to deal with toxic people. Some I have cut out of my life forever and it feels great.
Self help for depression, in my opinion, is crucial, you can't rely on someone else to fix you.