Lack of self esteem; (self-doubt) Help.

I have always been a good student, and over the time I have developed this obsessive thought of becoming good at everything and because of this I have become very self critical, and I don't think I am good enough. I always tend to seek for validations from others, I need to know if I am good daughter, or a good friend or sister. I just need to be good at everything which is definitely not possible for anyone I know that too. But because of this obsessive thought I have already done so many mistakes trying to fit in and I feel like I have lost my identity in order to impress and be good for everyone else. I can see myself doing things which were way out of my league just to impress others and get that validation of being perfect. And now I have come to a point where I am not doing anything and I am just sitting ideally and making plans in my head that how can I become PERFECT and now even the opinions of strangers matter alot to me. My mind is never at ease. Please help.