Hi,
First of all... I am very sorry that you are so confused and feel so lonely.
Than... yes, you can change! Of course you can!
But.. Do it for yourself, not for a gf, crush or anybody else, because that will not work. Do it to become more happy yourself and only if you are happy with who you are, are you ready to be in a relationship.
What I would suggest is to stop smoking weed right now. Smoking too much can lead to depression, paranoia and a whole lot of other bad issues.
If you have difficulty than just try to stop for 1 day. If you do.. try it again for just 1 day, and again and again. If you do smoke, donīt worry about it, and jus try again tomorrow. 1 day at the time until you donīt feel like you need it anymore.
Make a point in making new friends or finding your old friends. Go out with them, have fun!
Good luck turning your life around, and as they say... admitting the problem is the first step!
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