Probably abit late in this but at least I don't feel alone too. I am about the same body size too.

I started 1y 2m, I did put on some muscle during 1st 2 months but progress remain slow throughout my 1year.

My conclusion there is really no short cut. You need to increase the weight that you do, progressive overload. You have the $ hire the trainer for 6 months to get your form right. After that, continue on your own.

You are probably consider skinny by normal people.

It's a journey not a destination.