How can i know for sure if im a lesbian or just bisexual?

Do you need to throw a label onto your self? Yes labels help you figure out who you are but they also change all the time. Why does it matter who you like? You fall in love with a person after all

Only you can know. However, lesbians are only attracted to women, while bisexual people are attracted to both men and women.

With time and exploring yourself, make experiences, explore, try something and if you don't like it or you don't feel sure about it then there's the answer. Don't be afraid of explore your tastes.

Just think if you the fact of spending the rest of your life with a boy or a girl doesn’t make a big difference then you’re bi ! Or if you don’t feel comfortable being in couple with a boy or you didn’t enjoy sex with him and you did enjoy it with a girl then you are a lesbian ! So if you are not sure about your sexual orientation either a lesbian or bi , you can also know it and make sure of it by testing yourself , if you can get sexually attracted by boys and girls then you are bi , if only girls attract you you are lesbian

I don't know how old you are so I'm going to guess you're a teen/young adult and write accordingly. You will know with time, and perhaps with experience. If you feel comfortable enough try being both with guys and girls. Maybe you'll realize that it feels different, or that one just doesn't feel right for you. The key is not to put pressure on yourself to "decide" which one you are. If you give yourself time and be patient, sooner or later you will figure it out. Also, be aware that many bisexual people have a fluid sexuality, in a sense that sometimes they might be drastically more attracted to one gender. Whatever you do don't let anyone force you into labeling yourself. The right person will give you space to go at your own pace. :)