This concept of "motivational/self help songs" is hard to define but I'll try...

Don't Stop - Fleetwood Mac
Part of Me, Part of You - Glenn Frey
Has Anyone Ever Written Anything for You - Stevie Nicks
The Heart of the Matter - Don Henley
You Are Not Alone - Eagles
Take It Easy - Eagles
I'm Gonna Fly - Amy Grant
I Will Survive - Gloria Gaynor
Tubthumping - Chumbawumba
St. Elmo's Fire - John Parr
All Fired Up - Pat Benatar
Never Surrender - Corey Hart
Man in the Mirror - Michael Jackson
We Are the World - USA for Africa
Raindrops Keep Fallin' on My Head - BJ Thomas
One - U2
One Moment in Time - Whitney Houston
Fumbling Toward Ecstasy - Sarah McLachlan
Lean on Me - Bill Withers
I'm Still Standing - Elton John
You Can't Hurry Love - Phil Collins
The Gambler - Kenny Rogers
The Living Years - Mike and the Mechanics
Kyrie - Mr. Mister
Eye of the Tiger - Survivor
Refugee - Tom Petty
Steve McQueen - Sheryl Crow