Making dreams reality

I’m 15 and I have a dream. I have a dream to go to Harvard like my father. However, freshman year was terrible. I earned mostly As but had a good amount of Bs and B+s. I’m currently a sophomore and I’m getting all As. A couple A-s here and there. I just got my test back today and it’s the end of the marking period, I solved for the wrong thing on accident! I earned a B in the class now, cried a bit after school, and now I’m crushed. Do I have a future and Harvard academically? I’m taking the PSAT soon and my last PSAT score from freshman year I got a 1000 (new PSAT) out of 1600. Apparently 1000 is a very good score for freshman, so we’ll see how this PSAT goes. As for extracurriculars, I’ve done Key Club(volunteering) and Science Olympiad. I’m going to volunteer a lot this summer and volunteer at my dads hospital. He says it’ll look good. Anyway, am I totally screwed academically? I’m taking all the Honors classes I can and next year all the AP classes I can. If I work hard and get all As from here can I still get accepted. And if not can I go to UofM and then Harvard? How does that work exactly. I’d ask my dad but our relationship is quite ackward, though he’d know because he went to Harvard and M.I.T, he’s never home and always works. Thanks.

PS: I’ve got an urge to start a company this summer, Social Media Marketing. Any tips? What do I have to do legally? Thanks.