Im 18 busted with weed at school an i goin to graduate? will i go to jail?

hi me and 2 other frreinds skiped school and went to smoke weed outside of schoool as we wer walkin back to the school when the securty guys stoped us they checked my bag and found a bag of weed about 2 gs. im not sure if we wer on school campuse either. could they check me if wer not on school campuse for no reason? i just turnd 18 and im a senior i cant walk durin graduation with my freinds and im charged with possession and maybe disterbution too cause i gave some tom my freinds. im suspended or 10 days. iv never gotten in trouble till now iin school. im pin all my cles too. am i goin to be able to graduate at all? and am im goin to pirson? should i be honest all the way now and even tell them the person i got it from? help mee