1 Corinthians 13:4-7 for Dummies (and that dummy is me!). Google defines boast as does not talk with excessive pride and self-satisfaction about one's achievements, possessions or abilities. The opposite of boast is humility and modesty - that's what we should be striving for as we love each other.
Other translations broke it down where I could understand it better. Love doesn't strut (The Message), love doesn't brag (Easy-to-Read version), and love is not conceited (Good News Translation).
We aren't meant to love others to build up ourselves or our own egos. We love so that we can build up and serve others. The one awesome thing you can take away from this is that if boasting is hard for you - it's ok! All it takes is a little shift in perspective - not me, but thee. If we keep our focus on God, loving people the way He wants us to will become a little easier day by day.