A kid who harassed me and Mistrust in guys

Hey so there is the kid who I was friends with for 2 years and he is obsessed with me so basically I blocked him on my phone and Skype and then he made a different account to get in contact with me again I told him I want nothing to do with him and blocked him on that too it really got me a little scared but I blocked him he's been like this for along time he called and texted me way to much and started being mean a little bit so i blocked him on everything and he still doesn't get the message to leave me alone apparently so I blocked the account that he made to get in contact with me I just want to know if you have any advice for that.  There's another problem not related to the harass thing but I have trust issues with guys like I push guys away who like me and in basketball when they are blocking me I get so overwhelmed i don't like being touched by people I don't know what to do i just don't trust guys at all and any guy who likes me i push them away because I feel like they are going to hurt my feelings so I feel like I have to watch out and keep my guard up all the time.