Delima on staying a virgin?

well ive been going out with my bf for about 6 months now and i don't have any type of past ual experiences im still a virgina and 17 he's 18 and has only had oral jobs because he didnt feel ready for the other chicks and i was actually going to give it to him then dad gave me the talk that makes you feel guilty but he didn't know what i was going to do but now i have this guilty feeling and im not sure if i should still go through it and im a Catholic which makes it all the more hard should i just explain it to him or jus go through with it