Konada, I, too, was extremely skinny (skinnier than you) before I turned 18. I had an extremely fast metabolism and found it nearly impossible to put on weight. I was so skinny that kids two grades below me used to try to bully me, LOL.
For four years, every night I made a huge bowl of pasta and a 3000 calorie weight gain shake. It took me three hours every night to finish this meal. Doing this, I put on 10 lbs per year for four years. I went from 130 lbs (at 6'0) to 170 lbs. I was still thin, but I became stronger. I then went to every kid that bvllied me, and (tried to) smash them. Some still kicked my azz, lol, but I didn't care, as I was free. I wouldn't encourage you to do this, as I don't want you to get charged with assault. However, going forward, I would encourage you to adopt the following:
If somebody verbally abuses you, verbally abuse them right back.
If somebody physically touches you, try to smash them. Even if you get your azz kicked, you will never carry any psychological encumbrances in the future from this event.
If somebody steals money from you or schemes you, sue them. Even if you don't have money for an attorney, go to the local courthouse, educate yourself, and serve them with a Summons & Complaint.
Be relentless with your retribution.
Never let anyone capitalize on your psyche, ever. As you can see, the aftereffect can haunt you for life.
AS to what happened to you. It happened. You are human. Very few start off bold and relentless. Very few start off serving uncompromising retribution. Rather boys learn from their past transgressions and thus evolve into men. You can't change the past, but you can allow the past to catalyze you into becoming the man YOU want to be NOW. Who is this man in your avatar? He looks like a man with motive to kick life's azz with tenacious fury.