What to expect my first time?

ive been going out with this guy i met in town. after our first date it turned out he lived quite far away and so we wud have to have a long distance relationship. i decided i liked him enough to do it. hes coming up to see me at christmas but we talk to each other every day online. he made it clear he found me very attractive and wanted to have with me but i told him i was a virgin an wanted to wait and he told me hed wait as long as i wanted. hes a virgin too and said he was waiting for someone special. im turning 15 tomorrow and hes turning 18 in june. i no its a big age difference but it wont be in a few years. im really attracted to him and want my first time to be with him but im nervous. im on birth control (yasmin) but i take it different times thru out the day. what are my chances of getting pregnant? how much does it hurt ur first time? is it reallly awkward? i havent even had my first kiss technically (french anyways) so i just want to know exactly what to expect and if anyone else on yasmin can help clear me up about it like do i have to take it the exact same time everyday? or will i get pregant? even if ur not on yasmin please help me tell me what to expect my first time. thanks. by the way i no im really young to be having and its not a good idea and all. if u cud just move past that and help me that wud be great thank you :D