This is a novel about a kid named Victor Frankenstein who has neither the ability to foresee the consequences of his actions, nor any sense that he should take steps to try to mitigate those consequences once he knows they're happening. What he does have is an INFINITE capacity for self-pity, the lengthy expression of which I believe takes up the greatest part of the page count of the book. He explicitly believes that his life is harder and his suffering greater than anyone else's in the world, even though 100% of his problems are his own fault.
The narrative opens with a framing story (only the first of many in this Russian nesting doll of a book) about a guy called Walton who undertakes a sea voyage to the North Pole. In the form of letters to his sister, we get a pretty substantial and detailed account of Walton's life and how his father forbade him to go to sea but he did it anyway, and all the people he's sailed with and his reasons for going to the Arctic, and how his biggest problem in life is that he doesn't have any close friends, even though he apparently tells his sister everything.
Just as the reader is beginning to wonder if they opened the wrong file on Project Gutenberg, Walton spots an inhumanly large figure traveling by sled across the ice in the distance, and shortly after that he encounters Victor Frankenstein also traveling on the ice, nearly dead from exhaustion. Walton takes Victor on board and instantly falls in love with him, finding him divinely beautiful and obviously the one true friend he's been waiting for all his life. (It is soon apparent that Walton's problem is less that he's socially isolated and more that he's a horrible judge of character.) Learning of Walton's goal of reaching the North Pole and investigating why the compass points there, Victor gets very upset and warns that the search for scientific knowledge can have terrible consequences, and proceeds to tell Walton his entire life story.
( cut for length and 200-year-old spoilers )I think the key to Victor Frankenstein's character is when he mentions late in the book that he always felt destined for greatness. The book is a very accurate portrayal of a man who feels entitled to a great destiny, makes wildly reckless choices on that basis, and then screws everyone over by running away from the consequences and playing the victim instead of taking any responsibility. We can all think of men like this, which is what makes the book such an infuriating read. As the meme goes: ignorance is thinking that Frankenstein is the monster, knowledge is realizing that Frankenstein is the scientist, and wisdom is knowing that Frankenstein is indeed the monster.
Frankenstein is in the public domain, so you can read it
on Project Gutenberg if you like. Note that there are two versions of the book, the original 1818 edition and a substantially revised 1831 edition. I read the 1831 version because it's what the library had, but you can also read and compare both versions on a handy site called
Frankendiff.