It seems to me that this guy is a little controlling. Keep in mind, this is just from what I read on your post, so if the situation is different in real life, I would have no idea.
The fact that he is pushing to have a baby already is a little scary. You are right to wait, not only because you are young, and you want to get your education, but also because your relationship is not that old. If he is getting this controlling this quickly in a relationship, I do not want to see how he would be towards a child.
Also, the thing about the clothing is uncalled for, I agree. I wear comfortable clothing in my house, but newer clothing outside, not because I want to impress people, but because that is what makes sense (like what you are doing, wearing the new stuff to school, and the older/comfier stuff at home).
It seems wrong to give relationship advise without seeing both sides, so I will give a warning instead. Be careful in this relationship. He is trying to push for some things that are supposed to take time, and, from what I read, he is trying to control you even down to what you wear. I don't want to flat out say that this is a doomed relationship, because it still has promise, but if you do not set some boundaries soon, he will, more than likely, get out of hand.