Without the transactionID we can't really help. Post it here and we can investigate further.
What I can say is that you're using MultiBit Classic, which is very old and outdated... the fees it would have used would have been VERY low by today's standards, so I'm not surprised your transaction is stuck.
For low fee help, put your transaction ID in here:
http://www.mocacinno.com/page/feechecker and you will get a number of options.
Hey..How to switch to a new wallet from multibit 5.18? I don't want to send the money through the bitcoin network. Is there any workaround by which I can transfer my funds to a new and better wallet?
Please help me out.