I heard its a good thing to put others before yourself. How do I do that?
By knowing that you have the spirit and can serve god by helping others whether it'd be people struggling and such. If you see someone struggling, then you just go ahead and help that person with the problem. This could be anything from studying, to people with special needs and such. Just get out in the community more and serve others with as much as passion as you have. That's part of serving your Heavenly Father and Jesus. I'm sure they talk about this in your church.
If you know whats going on, you are situated, life is good...then you help others. Like if you see a disabled person having difficulty getting on the bus, let them go ahead of you and help them on. If you are really good in school, take some time away from your own studying to help someone who is struggling. The idea is to help people so that we all can share have better lives. Its easy to do, and it makes another person's life easier.