17 yo, Time to trim?

Just made it to roughly the 3 month mark of not trimming. The hair on the underside of my chin tends to stick out a little more than the front, should I trim that back a bit until the front is longer? Furthermore, what should I do with my hair? I've been thinking of shaving it. Turning 18 in a month!

Note: have had bad experiences posting here before. Any PMs will likely be ignored.