Work

I will have graduated from school by two years by this July.
My major is engineering. It's hard to for a girl to find a job related to this major.
After graduating from school, I took spent nearly half a year finding out what I want to do and what can I do. I used to be a material planner in a factory and I worked as a front-desk staff when I travelled to a tourist city. I wanted to stay longer but didn't have much money.
My current work have has nothing to do with my major but I like it. I'm an assistant in a foreign trading company. I have been working here for a year and a half. Our company sells dinerware. I find it interesting to work and communicate with various kinds of people. I also like the products we sell and the designs our clients provide. It's very beautiful like art.

Work

I will have graduated form school for two years by this July.I graduated from school two years ago this July. 
My major is engineering. I was an engineering major. It's hard to a gril girl to find a job related to my this major.
After I graduated from school, I took nearly half a year to find what I want to do and what can I I can do. I used to be a materials planner in a factory. And I worked as an front-desk staffreceptionist when I traveled to a tourist city where I wanted to stay longer but didn't have much money.
My current work have has nothing to do with my major but I like it. I'm an assistant in a foreign trade company. I have been working here for a year and a half. Our company sell dinnerware. I find it interesting to work and communicate with various kinds of people. I also like the products we sell or the design our clients are providing. It's very beautiful, like art.

I'm glad you found a job you like. It's not easy in today's economy.

About your first sentence. (I will have graduated from school for two years by this July.) This is a mistake because "graduate" is a short action that you finish in the past. It doesn't have duration, so you can't say you graduated for two years. Therefore the future perfect structure can't be used. Instead, we say: 

I graduated school two years ago this July.

My wife and I first met ten years ago this week.

etc.

You can also use future perfect if you substitute an action or situation that has duration: By July of this year, I will have BEEN OUT OF SCHOOL for two years.