Mattown,
Don't mind the boy's they could be right and they could be wrong!
Although your first hurdle to your dreams, is learning Mandarin, do what the rest of the USA graduates do, go to the language institute for the next 3 years and get stuck in.
To learn Mandarin in the USA is a no no, you need to dive in the deep end, where English is never used in the classroom environment, the teachers can be harsh and humiliating, but it either makes you or breaks you.
http://en.wikipedia.org/wiki/BLCU
http://www.blcu.edeu.cn/blcuweb/english/index-en.asp
I studied there for 9 months on an introduction course to mandarin, naively expecting to be with beginners, the class was full of Japanese and about 3 Europeans with experience, but I enjoyed every single day, and was humiliated a few times for being a bad student, the first couple of weeks, because i couldn't remember the stroke order of the 20 characters a day, one gets to learn.
The japanese of course don't have a great problem with the language, and pick it up rather easy, but one is thrown in at the deep end, because nothing is in English, but you will benefit much more from the experience, and learn much more quickly.
You will meet people from all around the world, doing 3 month courses to intensive study, it's really worth the experience, you can also continue doing what you do from there in most cases, and it's very good for networking with the 350 dorm Chinese females next to the block where you will be housed. The rates are very reasonable.
It does appear a little like, you are requesting approval from a forum of strangers that do not know you at all, and even if you did know them, many would still give the same feed back.
Only you yourself know if you can go the distance, so my advice is to take all what you have got of experience, learn some of the language in Beijing and wheel and deal from there, never doubt oneself, even when it is hard going, it's all about meeting and solving problems on the journey, the negative setbacks are all part of the learning process.
Just have enough money for a return ticket from Beijing, if you need it, and get out there asap, and use your skills to survive, you will be dealing with street wise people, so be careful.
I was also in shock when i first went, because I needed the governments approval, for undisclosed reasons, and they gave it, and i left within 5 days of getting the approval, not knowing what to expect, but with a business education, and a government backed international trade qualification, it was the only logical step forward for me, because i already had experience of Asian trade and culture, I was 42, back then, and the students i went through my studies with where in their 20's speaking several European languages back home it would have been difficult for me to compete in Europe, my experience with cultures have decided my journey.
Another tip stay away from Americans as much as possible, and mix only with the Chinese.
The China experience was one I shall hold close to my heart, because it was back in 92, when life was still very hard in China for many very well educated and professional people, with movement very restricted for students, today, it's very much the opposite, but caution and awareness is still vital for survival because of poverty.