First of all, you have to recognize that there is nobody out there - on a fundamental level - better than you, as a being. This comes more easily with age and experience - you meet a bunch of people in life and realize they all have flaws and problems and that the anomaly isn't a person who is stressed and afraid and self doubtful - the true freak of nature is a person who is superhumanly confident in themselves about everything all of the time. People just put on masks and airs to hide what they are really like, and 99% of the time it won't be any better than you or anyone else.
With that in mind, also you need to rein in potential problem feelings like envy. Envy - if you are not going to pursue a course that gets you exactly what you want in some non destructive way - is nothing but a destructive torment to yourself. Looking at other people and constantly coveting what they may look like, or what they have or imagining how perfect their lives must be compared to yours - trust me, never does any good. Take steps to become more like something you want to be of course, but do not fixate and what other people have. Fixate on your own journey.
Also, do not look for validation from others about what you are. That will leave you needing or requiring it for the rest of life, instead of developing your own inner strength to see you through when others are not there for support. They will not always be there, so it is best to sort out what you think of yourself first and foremost before you even begin to think about what others think. If you can find your value and direction internally you won't need anybody, and nobody will be able to tear you down easily, either.