Part of the work is about being able to see your accomplishments as a "big deal" to YOU. You're looking for external rewards but, as corny as it sounds, the rewards are within you.

There are many reasons why these people didn't give you the attention you needed.. and I get it, it stings. Our friends and social circle "ought to be" happy with us. Unless you ask them all directly, you'll never know why. So for that, it's pointless to stew over it.

Just be your authentic self. Make sure your feelings of proudness doesn't cross over into arrogance, as I've seen that happen in others, as well. If they continue to be unsupportive of you, make new friends.