Borderlands 2 is really not a hard game most of the time. There are some difficult enemies, sure, but pretty much everything in the first three or four hours is pretty easy. It also adjusts difficulty based on the number of players, so although it is best with multiple people, the game is entirely playable start to finish solo.

Do your side missions. Get the experience, get the weapons, sell what you don't need, grab ammo out of containers and corpses. If you don't have at least one gun with ammo at basically all times, you have a bad weapon set up.

That aside, good god are there any games you aren't bad at? It is getting way too easy to identify your topics.

Wow, you are just so helpful. /s

The Vita version is actually pretty solid. It was a little bumpy on release, but the folks who ported it actually kept patching it. They did not just let it die as a mostly functional downport, which I give them kudos for. I played through most of the game and a couple DLC packs on my Vita, and it was pretty enjoyable.

Health regen is definitely the way to go most of the time, especially against bosses who kill your shield super fast.  New players should grab one of those as soon as they can.

I'd also highly recommend the Commando or the Mechromancer girl for new players.  They're both kind of easy-mode.

Never had any trouble throughout the main quest, and I always played by myself. Raid bosses were certainly hard by myself, but still possible to beat in single player. You just gotta make sure to do most, if not all, of the side missions so that you get a lot of XP, and extra loot. If you're running out of money, just make sure to pick any and all loot and sell all the crappy ones.

Go change your title.... Borderlands 2 is a very easy game, your simply playing the game incorrectly. 

Ask for help and found out what your doing wrong before making flawed statement like Borderlands 2 is too hard.

Don't criticize the game if you've obviously haven't made your homework to understand the game. Which Character are you using and what skills tree have you focus??? This game can be played solo and co-op, the skills tree has skills that are better for use during co-op play and aren't has useful during solo play. 

It's not impossible though. You don't like challenges by your words.

Here as a last resort used the golden keys that will open up the chest in town:

SHiFT codes
Enter one of the following codes under your SHiFT account at Gearbox Software to unlock the corresponding bonus. Note: Some codes will eventually expire over time or number of redemptions. Also, there is a limit of keys that can be redeemed per account.

Vita code:
W353B-J3BK9-69X5B-ZBKJJ-55BZS
KTKTT-ZSFWS-R3CHC-9BW33-3JW3H
WJ5B3-BTTXZ-F3CHW-HJKJT-6HSZ6
WB53T-XHSKH-6TWZ5-SJKJ3-JXSHW
KT5BJ-36JJK-6S3CT-HJWBB-TZ9FX
KBWBB-6FWTW-6TCZW-S35BB-SCCZ9
KB5TT-9WT3C-XZTKB-9T53B-RBT5Z
53WJ3-6533K-XZBWJ-HJCBJ-BKXXS
5BK3T-CC3T5-FZJKT-9JCJ3-FRWR5

I knew this thread was yours from the moment I read it.

You really need to start getting good at games mate.

I reached level 72 with the gunzerker. If I were to rank Normal, TVHM, and UVHM from easiest to hardest, here's how I'd rank them.
UVHM>>Normal>>>TVHM
The reason I ranked TVHM harder than normal is because the enemies get a lot harder in the 2nd playthrough, and for me it took forever to find solid guns. If you have great guns TVHM should be easier than Normal.
UVHM is by far the easiest because by the time you are ~level 50-60 you will likely have very good weapons and the enemies don't get much more difficult. It was hard, but it gets easier later, with badass guns. 

EDIT: Another one of the reasons it likely got easier towards the end is because the gunzerker gets a lot of nice perks and skills near the end, so that's partly why it got easier in the end.

Whatever you do don't ever play Witcher 3 or make comments about that game.