Well many people say it does not hurt but for me it hurt and it just depends on your body.
Well you don't want him to know that you've seen him kissing another girl well you need to ask him because him might have another lover on the side the person you seen.It sounds like you guys will not last that long.
Well if you love him/her then you should tell him/her but if you don't then tell him/her how do you feel.
If you are in Arkansas, the age is 16 with parental consent and signatures. Check the Internet for information about the minimal age to get married in your region.
Either go to Google Earth or GoogleMaps. You will get your answer there.