major changes?

So im in chemical and biological engineering, and i dunno if i can handle this. i enjoy the stuff we do in my classes and i like this field of study, but i honestly dont know if i can pull the grades for it. whats sad though is that my alternative that i could enjoy would be architecture, and we all know how that goes. oh well, i have all summer to get excited about my major again and get motivated. i hope i do get motivated for next year