Hi guys I'm new to these forums. Just started playing SH4 again after being put of the first time by trying 100% realistic without knowing and failing miserably

I decided a couple of days ago to give it a try again and turned off some of the realistic settings. But now I have a problem, THis is what happend. I started in the Asiatic fleet based in Manila with a Salmon class aboard the USS Sturgeon.
Was doing fine suddenly Manila was lost as a base and I didn't know what to do. Searched this forum and found out I could check the save game file, and my new base was Surabaya.
The second mission from Surabaya was to transport supplies to the phillipines. During this mission I got a message saying my new port was Freemantle or what's it called on the west side of Australia. Sailed there barely making it because of fuel situation. But now I get the same mission over and over again. Transport supplies to Philipines, but the problem is I can't finish it because my fuel gets to 50% before I reach the destination and that simply tells me I would not have enough fuel to get back home if I continiue.
This is my fourth attempt to do the mission. The first time I stumbled upon a huge war fleet consisting of BBs, DDs, CAs and CLs Took my chances and hit both of the BBs with 4 torps each, Lucky me no duds with the MK14 yet

.
Since I forgot to turn of battery recharge after that encounter an surfacing again I continiued with my mission getting to 50% very soon. So I turned and headed home. Second time I crossed the path of a supply convoy, sunk 2 and damaged 4

, was a stormy night so the destroyers had probem with finding me. But used alot of fuel harassing that convoy so I had to return again without completing the mission.
Now the third time I get to 50% before reaching the mission destination so I had to return again.
And when I returned I got the bloody mission again

but the problem I can't reach it and I have a sneaky feeling that if I return without completing it they will send me out again on that mission.
Will it just continiue to send me on this mission or will I get a new one eventually. I also got a offer to end my captain career and become an instructor but I declined and lost all of my renown

after the third attempt.