If that is your dream go ahead and do it. Don't worry about 747's, 380's and the like, you won't be starting there. Your best bet would be instructing, by the time you have got a bit of experience under your belt the present depressed aviation market might have relaxed a little, eventualy you will get a break. Don't expect it to happen overnight and stick with it, its not easy but the rewards can be great and will make it all worthwhile.