Honestly, I'll be honest with the OP and say that to be able to as much as "pass" as a woman, jaw/chin surgery is likely needed - he does have a very large jaw and chin line that simply occurs on maybe 0.5% of the female population, that 0.5% of those women still being considered ugly regardless. Beauty is (maybe in Africa or the Medieval Days) subjective, gender usually isn't. You also do have a nose that appears more masculine than not, but I would leave that until after an improvement in the jaw and chin - it's much more common for a girl to have a masculine nose than a super-masculine jawline. One good thing is that, like me, you have very feminine eyes and having FFS will really bring them out.
Otherwise, I just don't think there's much you can do for now if you don't want the people your age to poke jokes at you. At your age (my age too) you will be joked about if you transition while literally looking very masculine, "->-bleeped-<-" will be the first thing that pops into peoples' heads. You say you won't be happy as a badly passing or very ugly female, and I say that while you still have some confidence about you (you're very good looking "as a guy" - you should at least be able to make many friends and snag high paying jobs without really even trying), try to save up enough money to have a FFS procedure or two. It's changed so many lives for the better.
Now, before anyone accuses me of being rude, the reality is that the jawline, chin, nose, and forehead are some of the features most reactive to male androgens, and these features only grow to large proportions if a body secretes a high level of those androgens. Absolutely no natal girls develop masculinizations of these features unless their body has a hormonal imbalance that causes too many growth hormones to be secreted. It just is very rare among natal females, and these features on men do hinder passing by extreme amounts, not to mention, if the person wants to achieve a generally (sexually) attractive appearance. It's what sucks about the human growth process, it's not my fault, I suffer from the effects of it more than most folks do.