Self love struggle

So I feel like I’m going down hill lately. I feel down and not myself. I feel like I want to be happy and I want to love myself again. I have started to work out at home and have ordered myself some gym clothes, it’s made me feel a little better working out, but o still don’t feel 100% me. I’m down because I don’t have the career I want and I’m just stuck in retail and see no way out. I want to be a dental nurse but don’t have the right qualifications which gets me down.

I’ve written what I want in life and what I need to do to get there but that just feels so far away and makes me sad because I don’t like how I’ve turned out atm.

I look pale and tired all the time, I go to bed late and wake up late like I wake up in the middle of the day and I feel like I lack energy and motivation.

Does anyone have any tips on how to make me love myself again and what makes people happy?

I’m 20 btw