Been going out with my girlfriend for nearly 8 months but don't see it working out anymore?

Well as you may know from the title i have been going out with this girl for nearly 8 months now but at the moment i find it really hard dealing with this relationship and i don't really have the time meeting up and that because especially I'm usually occupied being at college, doing work, and few occasions i do want some free time alone like playing xbox, see friends and that.

We do have some great laughs, there for each other whenever the worse comes up, do chat all the time like everyday on what's app, meet up usually once a week because i live near kidlington and she lives in wycombe so the distance can be tough at times and we met each other on a social networking site and ever since than we have been really great friends and bonding well and i really do cherish & love her. but as my dad passed away at February the 4th my life has been really hard, depressing and trying to struggling but we did ended up going out at around march the 25th and things have turned quite the better itself ever since than especially now that i turned 18, but now i realize that it did really go so quick these past few months and feels to soon to getting along well in life like sleeping over, being there for her all the time, taking my mind off things & that and i really do miss my dad and not because of that but also cant always come see her all the time as our family isn't earning much money at times and does cost quite alot like 10 quid for a single to wycombe and is annoying talking with each other everyday til we meet up the next week cause shes always attached to me all the time and to be honest id rather meet up with her all time whenever im free instead of texting because of the long distance.

Unfortunately my mum can be quite strict and ain't to happy whenever i bring her around and let her sleep over because of getting over dad which i understand because she wants me to be there for her but if i don't let her to sleep over at mine occasionally or to sleep at hers than my girlfriend gets quite pissed off to so there is no way on making both of them happy which leaves quite a damper to me :/

So things have been getting tedious and tough but at least you have a good insight of whats going on with my life, so I really don't know what to do because i really am fond with her and when we talk and finally meet up it is quite happy and special when we do but I cant always be there for her all the time and tell me what to do all the time like whenever we meet and that and I am thinking this relationship has been fun but gone long enough and is time we have had our separate ways and moved on but i really don't like the sound of breaking up with her and she gets upset and depressed that she would have a grudge on me and not be with friends with me anymore because i still want to be friends with her as this is my first relationship i ever had but i just don't want to be going out anymore so any suggestions on what my next move should be and how i can deal with this will would be appreciated and thanks for taking your time :) best answer gets 5 stars