Flat beer

I made a batch of lager and I just tried a bottle and it tastes completely flat is it ruined. I followed all the instructions carefully

How long has it been bottled? Did you remember to add the priming sugar?

It's been bottled only two weeks and yes I used sugar

And at what temp is it sitting for two weeks?

It was left in warm place for two days then put in my garage which is cold it is what the kit stated

Sounds like that might be the problem. How "cold" is cold in the garage...For most beers, 3 weeks at 70 degrees to properly condition beer.

Maybe 10c should I move it back to warm place and leave it there

I'll beat him to it: Read the below thread:

https://www.homebrewtalk.com/f35/bottling-tips-homebrewer-94812/#post1030387

I'm not sure if that link mentioned it (I didn't see it, if so...)...

The original post indicated this is a lager. Presumably the brewer lagered this beer for about 6 weeks at around 32 degrees. Often there are not enough yeast cells remaining in the beer after lagering and it's necessary to add some yeast cells along with the priming sugar.

Did you do this? If not, and if warming the beer for another week or so doesn't carbonate it, you may have to add a few cells to each bottle.