17 y.o. -birth control/sex advice please

I'm a 17 year old girl almost 18. I've had a boyfriend for over 6 months and I think I'm ready to show him my love and create a memory with him. He's the best guy ever he said he would wait for when I'm ready and I feel like now I am personally ready for this. My problem is, however, birth control. I want to go on the pill but I know for a fact my mom would never want that, she tells me all the time to wait till marriage and it would end badly if I say anything to her. My question to you is: do you girls think that a condom would be enough protection? I know it's 98% effective but I'm still a little uneasy just wanted to know other people's opinion and advice. Thank you somuch