Agree ^^^^

Flat bars are not for everyone but far to often people write them off and the 1st thing said is get a drop bar..

It's been my experience that flat bars can work just as well..

OP, as mentioned before check the following before writing off the flat bar

--Fit (I assume the bike has been properly fitted to you)?
--Saddle height, saddle position and angle.
--Stem angle

These are important as you don't want to much hand pressure on the bar. If you are leaning to hard onto the bar you will more than likely have issues.

Your hands should rest on the bar with little to no pressure. Also, don't grab / tightly grasp the bar as this will cause issues as well.

If you do get the bar ends, you may need to tinker with the angle of them a bit..

Once you get everything dialed in a flat bar can indeed go long distances with no issues.. I have been riding flat bar bikes for years. I just recently spent $3,000 on a flat bar bike. I could have easily went with a traditional drop bar road bike at that price point..

I ride about 40 miles a day, once a week I do a 60-mile ride and every so often I do a century = all on my flat bar.. I move my hands around on the bar quite often and I do use my bar ends several times while riding..

Disclaimer: I am NO expert and I am not certified in bike fitting.. I just know what works for me..

Whatever you decide to do, I hope you get it all worked out.. Numbness in hands and/or arms is no fun!