Someone once asked...
Someone answered with kindness...
I don't think being happy or excited after achieving/getting something you want is inherently boastful or egotistical although it may seem that way at times. You're allowed to share those feelings with other people without coming across that way so long as you're mindful of the moments in which you're sharing and not doing so excessively.
Wandering voices — answers no one has read yet
Another soul answered...
Appreciate yourselves
Another soul answered...
Dont mention it more than once a week or two. Dont talk about it to make the listener feel worse about not having it. If you remember youre not better at being a human than any other humans, then you wont become egotisitical. You can feel happy about it for as long as you want, being happy isnt bragging or being selfish; if someone tells you your being too happy they are too controlling and/or dont care about your wellbeing.
Another soul answered...
if you are boastful what are you without it