How can I use the law of attraction or affirmations to attract good friends and better experiences/moments?

I’d like to know what sort of affirmations to use to attract good, loyal, kind and trustworthy friends and to attract happier moments. Also, how can I use the law of attraction to hopefully get these things. I feel like I am happy in myself, but I feel like I should do some affirmations etc to feel better because sometimes I feel really negative about school etc. What are some good affirmations to use, or how can I use the law of attraction to achieve this? Thanks.