I think I need some help ...

For the past few days I feel so down and I don’t every feel like myself, I cry and think I’m just not good enough, I feel like everyone is just leaving me behind and I can’t even learn to live with a past that’s been gone for years, my boyfriend is being supportive and is trying his best but if this keeps up i think I’ll end up losing him and I really don’t want that because I love him so much, I just feel like I shouldn’t be here because I just don’t fit and it’s all so hard and I just don’t know what to do anymore ...