Depression

Hi, I'm 18 and I have recently been diagnosed with depression and been prescribed antidepressants for the foreseeable future! I was happy without being officially diagnosed up until my mum caught me cutting and trying to overdose! I don't know what I can do to feel any better, the tablets don't seem to helping me in any way! I feel so down about myself and my life and I just hate the way I am, there's honestly nothing that I feel like I can do to make myself feel better! I'm aware this may be too much for this app but I really have nowhere else to turn! I would be really thankful for any help I get, thank you in advance!!