High stress, Random depression.

I am in a constant state of stress with irregular depression. I can't help but think about my past and to some extent I regret many things. I regret missing so many opportunities when I was in std 12th and not delivering to my parents expectations. Actually they don't even realise this, deep down I know that I'm being hard on myself. Yeah I'm yet not placed but I know I'll be alright down the road because I've all the necessary tools to succeed but something is holding me back and at times it gets horrible and believe me when I say, I have these bad thoughts that are quite persistent. I wasn't like this a few months ago, I used to be happy, lively and I wanted to live life but nowadays each day feels like a drag. I wake up at nights and definitely have trouble sleeping, not insomniac per se but definitely a brainstorm of thoughts every time I try to close my eyes. I do admit there is a lot of animosity regarding my future and somewhat this is the root cause of all my suffering.