Selena Gomez feels ''a little selfish sometimes''.

The 'Heart Wants What It Wants' hitmaker says it is important to use her fame to give back and is taking her volunteering with A21 - a non-profit organisation that works to fight human trafficking - ''extremely seriously''.

She told E! News: ''I think that it's easy for someone in my position to maybe be associated with an organisation because they feel it would be great, they can contribute dollar-wise. None of that is wrong. I think for me, I've been wanting something that I felt like I could contribute most of my time to, because I love what I do, but I feel a little selfish sometimes and I have always said that. I take it extremely serious and my friends are heavily involved with me because it's not something happening a million miles away. It's actually happening here.''

Meanwhile, Selena recently revealed she has been silently supporting A21 for the past six months but remained silent about her work because she didn't want people to think she was doing it for attention.

She said: ''I wasn't going to immediately start discussing it. It's out of my comfort zone. I needed to be fully immersed in it. [It's not about] 'What a great thing another celebrity is doing' ... That's not why I want to talk about it. I can't be silent about this.''

Selena also took to Instagram to urge her fans to find out more information about

A21 on their website.

She wrote: ''Alright. Speaking from my heart for over an hour to someone who puts those thoughts into paid words can be hard for me. The older I get the more I want my voice to be mine. This is all apart of my work within an industry that's been around longer than all of us have been.

''The purpose of my interview was three fold. My work with A21, my new collection with Coach, and some new music. As I'm aware there will always be interests in one's personal life because that's the pace of our 'social' generation. I'm grateful for my position and I will always find ways to make my job more about others and giving back - all while having the best time with my music, fashion, film and my love for learning about the world that I'm eager to tap into more and more.''