Why am I failing even though I try so hard?

My 14 year old was caught drinking last night. He used his own money to buy captain Morgan and coolers.Three months ago he was caught vaping.He lies.I saw him trying to convince his girlfriend in a snapchat conversation not to take the vow of chastity she was thinking about.His gay friend asked him to kiss and and he would give him some alcohol. And he did.My husband and I talk about and think about parenting so much. We’re on the same page. We have consistent rules. We give him lots of attention and love. He goes to a great school and has a high average. He’s involved with sports teams and we talk to all his friends parents. We have the life 360 app and can see where he is. We talk to him about things like peer pressure, trusting your gut, making the right choice, relationship stuff including consent ... we are open and honest with him and I don’t know what else we can do.Is this normal teenage behaviour?Or are we doing something wrong?Or not doing something we should?Should we get him professional help in case there is something going on? via /r/Parenting https://ift.tt/2WSbMkv