Should I fix my 2007 Rendezvous for the head gasket? It has 154000 mil

My 2007 Rendezvous has only 154000 miles on it & I was wondering if I should have it repaired & what the expense could be to have it done! I'm a woman & I'm trying to avoid getting screwed over on this! Just saying!! I had white smoke and antifreeze is in oil...so pretty sure it's a head gasket!!