Sex and talking to parents

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So I’ve been getting more intimate with my boyfriend lightly. I am 14 and I know that’s a little young but I feel ready. I’ll be 15 in a month and I’m taking a lot of time to check in with myself every step of the way. I want to talk to my mom about it and maybe going on the pill as well but I don’t know how to start the conversation. I’m worried she will be disappointed in me or get angry. What if she doesn’t want me to see him anymore? She definitely thinks 15 is too young to be sexually active. So what do I do?