People keep comparing themselves to others all the time and many do it even without noticing. We are raised to believe that we have to be the best of all. When we are little kids, our parents tell us how we are the most beautiful children in the world and no one is more beautiful. When we grow up and start school, we spend years and years being compared to others by teachers and other students. I remember how we used to spend time having sleepovers and tell which one of us had the most beautiful hair, the most gorgeous eyes and even whose home was the prettiest. So it's not really our fault that we compare ourselves to everyone else.
However, this should stop. In surprisingly many cases people should just be selfish and be proud of themselves. Be happy with themselves and what they've reached. If someone close to you has succeeded, forget being selfish and be happy for them and make them feel good for what they've done. Remember how good it feels, when people are proud of you and give someone else that feeling.
Don't let anyone make you feel less about your success. There will always be someone who's envious and wants to talk you down and doing so, make themselves feel somewhat better. I know I've had this kinds of people in my life and sometimes I still do. When you tell about your success to these people, they will start talking about how they or someone they know has done the same thing long before and better than you. Just rise above it and keep being proud of yourself (don't have too much pride though, it's not pretty).
Like I said in the beginning of this post, there will always be someone who you think is better than you. Don't let it distract you, because hey, maybe there is someone who has done the same thing better. However your own success is exactly that: your success. You shouldn't compare it to anything or anyone else, but to the person you used to be. There's this quote that goes "the only person you should try to be better than is the person you were yesterday".
With these thoughts I will leave you with my current favorite song for the summer