I used to have such a hard time making friends. And then I hung out with some really social girls who got me out of my shell and I now have no trouble!!
1. Do not get dismayed- I remember if one person was offish or a jerk, I would recline from trying to socialize for a while. DO NOT DO THAT. I cannot stress enough how you just have to pick yourself up and try again with a new person.
2. Ask people for help- I have met countless people by just saying hi and asking for directions, homework help (if this is applicable to you) and whatever I actually would like an answer for. It makes them feel better about themselves that they have helped somebody, and you can sneak in some conversation while you are getting the help. Make sure the person is in your class or somewhere where you'll meet them again. I am not implying you should ask a stranger for directions and getting his number.
3- Smile and be as committed to the conversation as possible- People don't like it when you look over their shoulder to look at other potential friends. Smiling is friendly and open, it shows you want to be their friend. You are not the only person who wants a new friend.
4- Don't think you have to stick with one type- I used to think I could only make friends with other quiet girls who were socially awkward and quiet. While they are great people, they are not the only people you can click with. Try the socializer, or the loud one. They often are nicer then you thought, and they may help you be a little more relaxed since they are more comfortable with themselves.
I could give more tips but I can't think of any
GOOD LUCK
And if you really have a hard time you got a friend in me!