Apart from what Amanda already corrected, I have some adaptions :).

Definitely, I'm not traveling; [...] You set a comma after "definitely" because it's an introduction. If you wrote "I'm definitely not traveling", then it'd not need a comma :).

[...] Today is my 59th day (!), so I want to keep it up and also I want to work_out a bit—but I'm too lazy, hehe. Here I changed some stylistic things. It's always good to keep the sentences connected, so it's better not to start a sentence with "so". To maintain the "!", you can simply put it into brackets "()" :).

I want to read a book in English, because... Here is no comma needed before the "because" because it connects the independent clause and dependent clause. If you put the dependent clause at the start, then you would need a comma, like: "Because I need vocabulary, I want to read books," :).

...I want to learn more vocabulary, and I think... You need a comma because in the following clause "And I think" is an independent clause—independent clauses always require a comma. If you wrote, however, "I want to learn more vocabulary and think...", then you wouldn't need one because "Think" cannot be a single sentence; on the contrary, "I think" can be a single sentence :p.

I'm looking for a job, because... Same rule as above :).

I need to do my professional practice, and learn about the real life; I already got an interview and it was OK.—I'm in the selection process.

Goals for this summer.

I'm definitely not traveling. I wish I could but my wallet doesn't know what money means. ((VERY good use of figurative language & English idioms)) I've been refraining from/not drinking/keeping away from soda since April 20th; today is my 59th day! so I want to keep it up, and I also want to workout a bit, but I'm too lazy, hehe.

I want to design a helicopter in the software "solidworks". I need to imagine a helicopter, draw it on a paper, give it a size, identify the parts of it and those stuffs... that kind of stuff.

I want to read a book in English, because I want to learn more vocabulary and I think books can give me all that I need. What book should I read?

I'm looking for a job, because I need to do my professional practice, and learn about the real life, I already got an interview and it was ok; I am in the selection process.

Excellent