The 22 year old Mexican replaces Mercedes bound Lewis Hamilton for 2013, joining Jenson Button at the team.
"As soon as you walk through these doors, you see these great cars and there is so much history with this team that you immediately feel great. It's a dream come true to drive for this team," he told Sky Sports News.
Perez, who took three podiums for Sauber in 2012, insists that every driver at a top team must aim for the title.
"I'm here to give everything I can, to do my very best in every single race, inside and outside of the car, and to work with this great family at McLaren. When you come to McLaren, this [the world championship] must be your target, otherwise you shouldn't join McLaren. Everybody here is working for that goal and I'm coming here to do the same."
New team mate Button is now the most experienced man on the grid, with Perez acknowledging that while he wants to beat the 2009 champion, he must also learn from him.
"Jenson is a very fast driver and one of the best in the world. It's a guarantee he will be fast and competitive. I will have to make my own space, but I think I will be able to work with Jenson. I've got a lot to learn from him but at the same time I want to beat him."
Perez failed to score a point in the final six races of 2012 after being confirmed as a McLaren driver, although the Mexican insists that joining the team will improve him as a driver.
"Being here at McLaren will help me improve in many areas. It will be much more intense than I have been used to. I think once the season starts will look again at where we can improve, but first of all we have to go to testing and Jenson and I will have to do everything we can to make sure we have a competitive car".
McLaren will unveil the MP4-28 in the UK on January 31st.