Clingy bestfriends, or is it just me?

i don't know if it's just me or anything but i hate it when my friends always follow, i feel like they stalk me and become obsessed with everything i do. i really don't like it. okay, i have a lot of friends from different social circles, and i do like spending time with every one of them, and i hate to admit it but if i spend way to much time with a certain person, i ALWAYS find something irritating about them.

right well i have 1 friend in particular, that is really scaring me. she is jsut really, pft. she always follows me in school, it's so annoying, i don't get to see my friends anymore because of her, people think she's well wierd, oh, she's bi/lesbian too, i think she fancies me..i would write down everything but it's jsut too much to write down. she gets jelous of my other friends, i used to think she was cool and everything, she still is, maybe it's jsut a phase she's going through? the other day i wasn't in school, she had a massive go at me? erg. what should i do?
i also have this other friend, that i was with tonight. she asked me if i could sleep at her house today, but i said that i had to do something tommorow, and my mum will say no anyway. the half an hour walk home she made me call my mum 2 times to ask, and she complained about it the whole way. she even said that she should go talk to her herself. when we got to her street i insisted she go home, she said no and then we went to my street, and got to my house, i went to hug her and say bye and she asked 'can i not come in?' and i was like 'oh okay, if you want?' so she came into my front room, with a huge frown, and asked my mum herself if i could sleep, my mum said no countless times, and then i asked her if she was okay walking home by herself in the dark, or if she wanted to call her mum, then she said 'aren't you walking me home?' and then i asked 'well, i would have to walk home by myself?' so i ended up walking her home anyway, i then went 'isn't my mum a b**ch?!' and then she said 'no, because she said you could sleep!' i was like wtf..she was ebing c*cky all the way home, i walked her to her street, and then went home, about 20 minutes later after i got home, she called me asking me if i was sure if i didn't want to stay, i said no, and then she insisted my mum to talk to her mum. at this point i was thinking 'why are you calling me after you were such a b**ch? :s' then she hung up on me, around 2 minutes later she called me again asking me what time my thing finished tommorow? and i said around 2, why? and she was like oh i was wondering if you could come to mine tommorow, but i have to get ready for my cousins engagment, i was like okay..

for those of you that were bovered to read all of this, i am not a b**ch, i don't b**ch about my friends in real life, i grew up with the moto of 'if you have nothing nice to say don't say it' and have always treated people liek how i would like to be treated, but i get so fustrated!