REGRETS!!!!

i've never believed in regrets...i'm actually a very strong believer in 'everything happens for a reason'..so why am i sitting here regretting every decision I ever made. I just realised that i messed up my life big time by being care free...I see no way of fixing it all and i don't know what to do. thoughts flowing through my mind if the vast quantities of wrong i've done in my life. too much to count, too much to fix..enough to give someone to judge...enough that i'm paying for it all. all alone with nothing but my thoughts that eat me alive..slowly killing me...ruining my life more and more each day but yet no sloutions. my source of happiness now makes me sad..so what do i do to make me happy again..how do I get through it all. i really have no clue how to get through this one.......