Teens must generally compete with adult poets, many of whom are college trained and educated. This may not be as much problem as it seems. A fresh approach may be plagued by cliches but also have stunningly brilliant insights. The intuitive mind of a teenager can be as much or more in tune with the subconscious source of creativity than any trained poet. Unsorted ideas may contain wealth just as river or ocean sand may contain gold.
Inexperience often contains the free thought of uninhibited creativity.
Don't be intimidated by adults who can find flaws in your poems. A serious critic can also find flaws in all the old masters. Take your strengths and weaknesses in stride, and write enthusiastically. Save it all and reread your lifetime output. If you give it a chance, it could grow in your lifetime to match any of the greats of poetic history.