Interesting, sensual, cozy, question....plzzzzzzzz answerssss r needed?

have been talking to this girl who is very nice and cute 4 abt 3 weeks and asked her to go 2 lunch with me and we did. i kinda had a great time with her, and what seems to be the problem is that i like her and want to do more things with her (like fooling around and also wana have ual relationship but not be her boyfriend. i mean i dont mind being her bf but i am a very busy guy working 30 hrs and full time student.and being the oldest sibling of a single mother i need to be around the house doing a lots of arons. and i promised my mom that i wont let her down cuz i agreed on not going after girls until i get myself in med school. my mom made it clear that im not suppose to have any relationship with girls unless i am in grad school and i need to set a good example for my younger siblings since our dad's not around. i like this girl a lot and dnt wanna hurt hear feelings and i will try to commit as much as i can but any help would be great friendz