Here is  a game I thought I had won until my little brother hit me and made my mouse slip when i had it on touch move but can anyone tell me how i did up to this point

I'm not a strong player, but I'll offer a little analysis.

3.Nh3 seems weaker than 3.Nf3, as not only does it cover fewer squares, but remains inactive.
3...g6would be a fine move if you were planning to fianchetto your dark squared bishop with ...Bg7. One thing you don't want to make in the opening are moves which serve no real purpose (i.e. no threat, no protecting of squares, setting up combinations later on, positional play, etc.).  Not to mention, as the game unraveled, it gives black a cozy outpost for his pieces on H6.
6...Na6was a weak move by you too...Although not always true, a good rule of thumb is "a knight on the rim looks dim"  The more squares a knight covers, the more effective it becomes.

Getting a little headache, so I'll wrap up.  Your play was pretty good.  One move probably would've played in your position would've been 19...Qe2.  This forks the Bishop and Rook, and the only possible move which prevents white from mate or losing the bishop is Rb2.  This would've bought you time to develop the rest of your pieces and then have a strong position for the win.

Although it's great to have other people analyze your game, you should go through it by yourself (or even better, with your brother) and talk about what you were thinking.  You'll be amazed how many great moves you overlooked, and you will also see tendencies you have. 
Hate to sound preachy, but in the opening (and throughout the game) mentally ask yourself, "What does this move achieve?" and make sure that it's a good move, regardless what your opponent might play. 
Keep on playing, you'll only get better!

Three mistakes

you played a bad game  like you were in a rush

dont do stupid thing like 6.Na6, why would do anything so stupid you lose control of the center and your final mistake was when you moved the bishop to d6, why would you do tha, that position is pointless and weak.  Don't tryto show off get to the point.  Simple stuff will win you games.

I like the game you chose to post haha