There's nothing wrong with these feelings. They are God given. We all are important and needed and appreciated. And we all matter. God doesn't create people because He had nothing better to do. He creates intentionally and with love and joy and hope.
There's a problem with wanting to feel important and needed and appreciated and knowing we matter though. The problem comes when we think, "Hey, what about me?"
We won't always be included in activiies and events. The light will be on others. There will be times that we are left while others are doing some big "important" work. In these times we might start saying to ourselves, "What about me? How come I can't______? How come people don't have time for me? Me? Me?"
If we continue with this line of thought we are going to find ourselves in a huge pity party. We will miss opportunities God wants to give us. We will miss the blessing because we are stuck inside ourselves saying, "I'm important too!"
I did this yesterday (And I'm kicking myself today -- which I shouldn't do. Okay, I'll stop right now). I missed an opportunity to bless and encourage others because I was having a pity party. I am thanking God He got me out of it pretty quickly and kept me from doing any damage to those I love. His grace is amazing. His mercy is profound. And so thankfully and lovingly, He didn't condemn me. He just showed me my sin and got me back on track.
If you find yourself in a pity party, exit immediately. Don't even say goodbye to the host. Leave and ask God to shake all evidence of this party off you.
"There is therefore now no condemnation for those who are in Christ Jesus." Romans 8:1