If you don't get help chances are that you will either have a lousy depressing life or that you will do something awful & end up having a horrendous nightmarish life - possibly in jail being used by older stronger people for sex>> std>> death. Neither are lives i'd like for anyone.
You have come for help but it is up to you to take it & act to get help>>talk to your dr about seeing a psych, &/or see if there are any support groups, counselling groups etc (anything) that deal with low self-esteem, poor impulse control,etc. Then go rfom there.
Good luck pm me if you want to talk as I suspect there are deeper issues behind this but with no idea what they are I can't give more specific help/advice.